The snow has arrived early in Reykjavik after an unusually long and warm summer. The freeze has brought out the ghostly green haze of the aurora borealis - the Northern Lights - the shape of which shifts dramatically across the tiny city's black skies.

The bars and restaurants of Iceland's capital are packed, the Range Rovers and BMWs are parked nose to tail all along the streets of the central 101 district, and music is pumping from a black stretch Hummer limousine cruising by.

'What can we do? Its difficult times but we've spent all day talking about it, watching the news getting worse and worse. We had to go out and be with friends. Maybe it's like the party at the end of the world,' says Egill Tomasson, 32, sitting in the Kaffeebarinn bar.

Iceland is on the brink of collapse. Inflation and interest rates are raging upwards. The krona, Iceland's currency, is in freefall and is rated just above those of Zimbabwe and Turkmenistan. One of the country's three independent banks has been nationalised, another is asking customers for money, and the discredited government and officials from the central bank have been huddled behind closed doors for three days with still no sign of a plan. International banks won't send any more money and supplies of foreign currency are running out.

People talk about whether a new emergency unity government is needed and if the EU would fast-track the country to membership. On Friday the queues at the banks were huge, as people moved savings into the most secure accounts. Yesterday people were buying up supplies of olive oil and pasta after a supermarket spokesman announced on Friday night that they had no means of paying the foreign currency advances needed to import more foodstuffs.

This North Atlantic volcanic island, which is the size of Cuba, with a population of 320,000 - the size of Coventry's - is an unlikely player on the global financial stage. It is famous for its fish, geysers and for winning the UN's 2007 'best country to live in' poll. But Iceland built its extraordinary wealth on the crest of the worldwide credit boom and now the crunch is sweeping it away, bankrupting a people for whom the past eight years have been, for most of them and by their own admission, one long party.

The nation's celebrated rags-to-riches story began in the Nineties when free market reforms, fish quota cash and a stock market based on stable pension funds allowed Icelandic entrepreneurs to go out and sweep up international credit. Britain and Denmark were favourite shopping haunts, and in 2004 alone Icelanders spent £894m on shares in British companies. In just five years, the average Icelandic family saw its wealth increase by 45 per cent.

But, as a result of the international banking crisis, the billionaires who own everything from West Ham United football club to the Somerfield supermarket chain, Hamleys toy shops and the House of Fraser, are in trouble and the country is drowning in debt.

Iceland's cheap labour force, the Poles and Lithuanians, have left already - there's little point in sending home such a worthless currency, and the tourist season is over. Iceland is on its own.

In the Kaffeebarinn, Egill Tomasson isn't drinking because he has a music festival to organise. Iceland Airwaves takes place in a fortnight, when more than 100 Icelandic bands and 50 foreign ones will play in venues around the city over four days. Most of the tickets have been sold in krona, but the international acts need to be paid in euros, which is going to cost the organisers dearly.

'People here are going to need this festival,' says Tomasson. 'This crisis has been a heavy blow. And many people should have a bad conscience for what has happened. Someone should be prosecuted, they have sucked Iceland dry, taken the money and ran, and left us totally in the shit. People I know who have gone to the UK or the US to study have found their grants worthless, they are stranded.'

Like many his age, Tomasson has only a vague memory of harder times, before the boom that brought Iceland the highest per capita wealth in the world. Older islanders call them the 'Krutt-kynslotin' - the cuddly generation. Eco-aware, earnest but pampered, they drift from organic café to bar, listening to the music of Björk and Sigur Rós, islanders who have made it big abroad. 'They will have to get their hands dirty now,' says chef Siggi Hall, Iceland's answer to Gordon Ramsay, with an effusive vocabulary to match.

'That's good though, they are the I-generation; iPods, iPhones, everything starts with I. Well, we will have to go back to the basics now. Icelanders are risk-takers, but hard working, they will have to downsize. We will have to eat haddock and Icelandic lamb and forget these imports of goose livers and Japanese soy sauce. When everyone was extremely rich in Iceland - you know, last month, it was with money that they never have earned. Now those who were extremely rich are just normally rich, but they think they are poor. They were spoilt, spending billions.'

Hall is due to open his new restaurant on 17 October, but insists the crisis is not worrying him. 'I had been losing customers because people were flying off to Copenhagen and London and New York for the weekend, to eat out. Now they will stay in Iceland, but they will still eat out. People need to eat.'

Outside the city's Hofdahollin car showroom, looking a little rumpled for men trying to sell new and used cars for £35,000 and up, owner Runar Olafsson and his top salesman are sharing a Marlboro. They are not expecting any customers today. 'A few years ago we couldn't get enough top-end cars and we started importing them. We were selling 120, 140, a month. But it turned around so fast,' says Olafsson. 'It's so dramatic, just in one month. We have already seen two dealers go down.

'Customers would come in and we would apply for credit online for them, a 100 per cent loan, and they can drive away in their new Range Rover. It took ten minutes, it was very easy. But 60 to 70 per cent of those loans were in foreign currency, Japanese yen or Swiss francs, and they have gone up 90 per cent as the krona burns. A car worth 5 million krona now has a 9 million loan on it; how are people going to make those payments?'

Foreign currency loans are a problem for homeowners, too. 'Loans have been very cheap, house prices rose and there was a lot of good-quality housebuilding. But the building has halted, nothing is being finished, nothing is selling. The interest rates are staggering. What people are doing now is swapping houses if they want to go bigger or smaller. That is what is keeping us afloat,' says estate agent Ingolfur Gissurarson. His mobile goes off - the ringtone is A Hard Day's Night by the Beatles. 'I changed it to suit the times,' he smiles.

Blame it on the Vikings. Icelanders like to hark back to their ancestors, the rebel Vikings who, as the nation's most revered daughter Björk once explained, 'couldn't deal with authority in Norway. So they flew off in this mad ocean in a wooden boat which is pretty hardcore, North Atlantic in the year 800. And they found this island full of snow ... yeeeah!'

'The Icelandic psyche is an important part of all of this,' says Hellgrimur Helgason, who writes an outspoken newspaper column which exposes feuds between Iceland's ruling class and its entrepreneurs. He is also the author of 101 Reykjavik, a popular novel populated by 'Krutt-kynslotin' characters.

'Before the market reforms the country had stagnated, no one thought Icelanders could be businessmen. We were poor fishermen or farmers, so it had an incredible effect on confidence when we saw these young men out buying up British and Danish companies. Everyone grabbed at the new opportunities like children. Really, it was no surprise that Hamleys toy shop was one of the first purchases.'

Gunnghilder Sveinbjarna and her friend, Anna Lara Magnusdottir, are ordering their second bottle of red wine in the Philippe Starck-designed interior of Reykjavik's Bar 5. Tonight the young women are feeling no pain.

'We come out at the weekend to forget our children and our problems, and this time we will drink extra hard to make sure we forget the economic crisis too,' says Gunnghilder, raising a glass. 'Tomorrow the sore head.'

The door to Hell

• Iceland is known as the Land of the Midnight Sun because in summer there are almost 24 hours of daylight.

• There are 15 active volcanoes in Iceland, including Mount Hekla, long believed to be the entrance to Hell.

• More books are published per capita in Iceland than in any other country.

• Many Icelanders still practise the old Viking religion of Norse mythology.

• Icelanders drink more Coca-Cola than anyone else in the world.

The British connection

• Iceland's biggest bank, Kaupthing, has investments in Costcutter, Somerfield, Jane Norman and the Laurel Pub Company which manages the Slug & Lettuce chain. It jointly owns Kaupthing Edge, an internet savings bank with 150,000 British savers.

• Baugur, an Icelandic international investment company, has significant stakes in Iceland supermarkets, Moss Bros, French Connection, Woolworths, Saks, Whittard of Chelsea, Goldsmiths, House of Fraser, Whistles and Oasis.