Ask any GTA fan what their favourite mission of all time is, and Three Leaf Clover is guaranteed to rank highly. The heist mission from Grand Theft Auto IV encapsulated everything that was great about the series in 15 minutes of gaming nirvana. It had everything: a bank robbery with hostages held at gunpoint; a shootout against SWAT teams on the streets of Liberty City with police helicopters circling above; and a last-ditch attempt to escape the cops by fleeing along the subway tracks on foot. It was action packed, was bursting with variety and was superbly paced. It was the perfect GTA mission.

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The mountain bike returns in GTA V. Race to the top of Mount Chiliad?

“ Los Santos has a very different vibe compared to Liberty City. It’s more open, less claustrophobic.

GTA's take on Venice Beach is where we first meet Franklin.

“ Trevor is the most colourful of GTA V’s protagonists and arguably the most psychopathic lead ever to appear in the series.

The pickup truck burns after Trevor experiments with a jerry can of gasoline.

“ The Los Santos skyline looks beautiful, the monolithic skyscrapers cutting dark, ominous silhouettes against the orange cloud-kissed sunset.

Trevor and Franklin meet for the first time, just before taking off on the mission.

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“ The three-character set-up lends itself perfectly to co-op.

Playing as Michael you fire at IAA helicopters from inside Trevor's chopper, while Franklin snipes from a nearby roof.

Click here for the full rundown of this week's GTA V blowout.

So it’s hard not to feel a pang of excitement when Rockstar says that Three Leaf Clover is the inspiration for much of Grand Theft Auto V Heartbreakingly, Rockstar is not quite ready to show off the heists in Grand Theft Auto V just yet. However, the first mission unveiled is just as explosive and, more importantly, it perfectly demonstrates the dynamic between the game’s three protagonists.Michael is the first to be introduced, sitting next to the pool on the terrace of his grand mansion. He’s an ex-gangster who made his money and is now working with the government under a witness protection scheme. He enjoys the finer things in life, and there’s a fewer thing more luxurious than his sprawling home, with stunning vistas across the city, tennis courts and a plasma TV so big it’d put most multiplex cinemas to shame. Works of art adorn the walls and expensive furniture is dotted throughout every room, but Michael's life isn’t without problems. His relationship with his wife is evidently beyond repair and the only words they share when they pass in the hallway are expletives, before she barges through the front door, takes the sports car and skids off into the distance – no doubt heading to the nearest mall to spend even more of Michael’s money on overpriced tat.Elsewhere in the house, one of Michael’s daughters is playing a rhythm action game and barely acknowledges his presence when he walks in the room. Despite appearances, life isn’t all that sweet.Los Santos has a very different vibe compared to Liberty City. It’s more open, less claustrophobic, and it feels more relaxed even though it’s just as busy, if not more so. Indeed, Rockstar claims GTA V has twice the number of types of pedestrians going about their business in the game, which we hope makes for a much more vibrant environment to explore.Even the cops are more prevalent and when we switch over to Franklin his drive through Los Santos is interrupted by the shrieking of police car sirens in the distance, shortly followed by three cop inceptors cutting through the traffic in pursuit of an unseen felon. Obviously, we’re all used to feeling the heat on our backs when we’ve broken the law in previous GTA games, but the presence of the boys in blue feels much more evident in everyday life in GTA V.As for Franklin, his method of getting to the meet-up with Michael is far more sophisticated than riding a mountain bike. He’s a repo man working for an Armenian luxury car dealership, so his car for the day is Grand Theft Auto’s equivalent of an Audi R8 Spyder, the 9F. It’s a beast of a machine and is the first time convertible cars have been properly realised in GTA. It may not sound like much, but the moment you climb inside and the roof pops down you cannot help but smile. Sure, it’s a tiny detail but it’s things like this bring the world of GTA to life, and GTA V is bursting with such moments.It’s also here we’re treated to a glimpse of one of the game’s many dynamic events. Like the dynamic events in Red Dead Redemption, these aren’t side missions per se – although GTAV is packed with these too, such as assassination missions – but procedural moments that you either get involved with or ignore. As Franklin waits in a parking lot a Gruppe 6 security van pulls up. It’s begging to be stolen, but do you strike now, dragging the driver out of the van and attempting to escape through the jam-packed streets of the city; or do you tail it and wait until find a quiet intersection where there are fewer prying eyes? Either way, successfully pull off the robbery and the cash is yours, and according to Rockstar there will be far more ways to spend your hard-earned (or hard-stolen, as the case may be) than in GTA IV.Yanking up his trousers without wiping (his mother would be appalled), it’s immediately apparent this guy is a handful. Even though you’re controlling him, he feels unpredictable, no more so than when we’re shown a couple of new touches for GTA V. Trevor, after driving along the dusty roads of Blaine County, past Mount Chiliad towering in the distance on the other side of the Alamo Sea, pulls up on the side of the road and grabs a tank of gasoline from the back of his pickup truck. He then tips the jerry can upside down and pours a trail of gas that leads to the truck. One strike of a match later and BOOM! Fire engulfs the vehicle while Trevor stands back and admires his handiwork. As the rubber from the tyres burns fiercely, thick black smoke spewing into the sky, we’re left wondering how many other neat touches like this there are in the game, and how players will use such freedom to create an almost limitless collection of tools of destruction. Then again, anything in Trevor’s hands can probably cause an awful lot of damage.The question is, what’s this guy like when you’re not in control of him? By now it’s common knowledge that you can freely swap between Grand Theft Auto V’s three leads, and that while you’re not directly controlling them the other two will happily go about their everyday business. But in Trevor’s case, on the evidence provided, this is one guy you want to keep on a short leash.Switching between characters is fast and effortless. An on-screen menu displays which characters are available (one might not be, especially if you’re in-mission) – select one and the camera pulls out and shoots skywards to show a bird’s-eye view of the map, before panning to the next location and zooming back towards the ground to plant you inside the brain of your chosen character. It's very reminiscent of Call of Duty: Black Ops II's Strike Force missions, where you're also able to switch characters who have different specialities for different tasks.Even though Michael, Trevor and Franklin lead very different lives, as the story unravels they become close. The mission we’re shown, which appears early in GTA V but isn’t the first, opens with Michael, who arrives at the meet-up with Trevor. These two go way back, but they’ve been recently reconnected through Michael’s work with FIB, which is GTA’s equivalent of the FBI. The pair have been drafted into to carry out a hit-and-run against another government agency and their target is being held in one of the upper floors of the IAA (read CIA) building in downtown Los Santos. This being GTA, walking up to the front door and ringing the bell is not going to get him out.Back to the mission and the plan is simple: experienced pilot Trevor will fly a chopper to get Michael close to the target while Franklin provides sniper support from a nearby skyscraper.We play out the first part of the mission as Trevor, flying the chopper with Michael riding shotgun. From above the Los Santos skyline looks nothing short of beautiful, the monolithic skyscrapers cutting dark, ominous silhouettes against the orange cloud-kissed sunset. To the east it’s possible to just make out Del Perro pier and beyond it the ocean, while to the west there are the rolling hills of the countryside. Far below freeways and roads snake in all directions and the pin-pricks of light reveal a city going about its business.The short flight provides a brief glimpse of the scale of the game: Rockstar has already gone on record and said Grand Theft Auto V will be around five times bigger than its predecessor, and what’s visible from the chopper is about three-and-a-half times bigger than the sprawling deserts of Red Dead Redemption.As ever, a mini-map in the bottom-right of the screen pinpoints your objective. It also displays an artificial horizon while flying, which pitches and yaws as the chopper circles the tight cluster of buildings that makes up central Los Santos.There’s only one building we’re interested in, though, and as Trevor eases the helicopter onto its roof control switches to Michael, who steps out, hooks a wire onto the building ledge and rappels down the side. The game’s fastidious attention to detail is immediately apparent at this point – long shadows flicker across the glass building as Michael edges his way down and inside office workers go about their business, seemingly unaware that some guy in a black one-piece is looking through their window on the 30th storey.As Michael approaches the target floor the camera switches to inside the building, where a man, strapped into a chair, is being interrogated. Screams echo around the room as a torch slammed down onto the desk splinter his fingers into a bloody mess. You’ve only got seconds to react, firing at the glass and crashing through the window to his aid.Rockstar stresses the game can be played in different ways. For example, in this instance you can play purely as Michael, gunning down the four agents in the room before grabbing the hostage and bailing out of the window. Alternatively you could switch to Franklin and watch the action unfold from afar, peering through the optics on your sniper scope and lending a helping hand by picking off enemies as they pop into view. Or, as we witnessed, you can switch between the two, executing the smash and grab yourself before taking control of Franklin as Michael is winched back up to the chopper.Having the freedom to switch between characters not only ensures you tailor the experience to your tastes, but also eliminates flat spots in the action. You’re always at the heart of what’s going on, whether you’re piloting a helicopter, shoving a gun in someone’s face at point-blank range or popping heads from a rooftop.The closing stages of the mission are equally open and as Michael is pulled back inside the helicopter, you have three options. You can continue to play as Franklin who, when agency choppers arrive quickly on the scene, can cover his buddies by taking potshots at enemy pilots in an attempt to bring them down. Or you can switch back to Michael, who’s able to open up with a machinegun as the heat closes in. Lastly you can choose Trevor, who tries to shake off his pursuers by weaving between buildings and getting the hell out of there as quickly as possible.One thing we do know is that all three characters must survive in order to succeed the mission. Additionally, Michael, Trevor and Franklin each have their own side missions open to them, as well as the side missions that are shared across all three. Rockstar wouldn’t be drawn about specifics but hinted that they’ll tie in with each of the characters. Will Franklin make a bit on the side by trading rare cars for cash, or will Trevor be called upon to fly stolen goods from the a pick-up point in centre of the city out into the countryside? We’ll have to wait and see.Also, while Rockstar is not talking about multiplayer yet it’s certainly a key focus, and the three-character set-up does mean that some missions would lend themselves perfectly to co-op. It’s unlikely the entire story will be playable in co-op – Rockstar has said as much - but planning and eventually taking part in a huge heist alongside your best mates is something I personally hope for.And that’s what’s particularly exciting about Grand Theft Auto V. From the briefest of glimpses we can already tell the city of Los Santos is a place we want to spend more time in, and getting to know Michael, Trevor and Franklin better is something we cannot wait to do. There are questions that still need answering – has the combat been refined or completely overhauled, and more importantly does the inclusion of three characters means there’s far more replay value or does the story always follow the same path?One thing’s for sure, the most exciting aspect of GTA V is not just the way it promises to shake up the open-world genre, but also the freedom and flexibility it promises. Tackling the same mission in different ways has always been a hallmark of the series – carrying out chase missions in Vice City in a Hunter helicopter is one of my fondest GTA memories – but it’s never been truer than it is here. What’s more, if pedestrian fetch quests really are a thing of the past and the promise of a consistently up-tempo yet satisfyingly deep story is deliver upon, Grand Theft Auto V could be the benchmark by which all other games – not just open-world games – will be judged against.

Alex is IGN's UK Editor-in-Chief. He used to rob banks for a living but has since retired to write about videogames. You can check if he's broken parole on IGN IGN and Twitter