C at People owes a surprising debt to Citizen Kane. After Orson Welles’s magnum opus flopped at the box office and drained the coffers of RKO, the studio looked to producer Val Lewton to make them a quick buck. What better than a low-budget horror film? He hired some of Welles’s old crew and borrowed the staircase from The Magnificent Ambersons for his set. But Lewton was a virtuoso in his own right, not a simple workhorse. Having found an ally in director Jacques Tourneur, who went on to make the seminal film noir Out of the Past, he chose to ditch the gothic finery and gaudy effects that Universal’s monster movies had made fashionable. What he came up with instead was more terrifying than ever before.

Low on resources, the pair created a new kind of horror language. Cat People, released in 1942, is a film driven purely by shadow and suggestion. It’s a were-cat film with no lurid transformation scene. The monster lives almost entirely outside of the frame, where our own imaginations can colour it in to be as blood-curdling and gruesome as we desire. What it may lack in old-fashioned spectacle, it more than makes up for in atmosphere. Cinematographer Nicholas Musuraca paints each frame in black as deep as the ocean, where all manner of beasts dwell – a technique he’d later revisit on Out of the Past.

Inspired by Lewton’s own short story The Bagheeta, but written by DeWitt Bodeen, Cat People concerns the terrible fate of Irena (Simone Simon) a Serbian immigrant to New York City. She falls in love with a man named Oliver (Kent Smith) but refuses to consummate the relationship, convinced she’s descended from a group of devil-worshippers who turn into panthers when aroused, jealous or upset. With almond-shaped eyes and triangular features, Simon looks perfectly kittenish. She commits to Irena’s hysteria but, at times, still lets her be a little mischievous and aloof. If she were to suddenly swat a glass off a table, no one would think twice.

In the film’s most effective sequence, Irena follows another woman home. It’s the middle of the night. The woman scuttles nervously from street lamp to street lamp. All that can be heard are the clattering of high heels, as figures slip from darkness into light and then back into obscurity. This goes on and on until it feels like the whole film is about to implode from the tension – then a sudden, violent hiss. It’s not a panther come to feast, but the sound of a bus hitting its brakes. It’s one of cinema’s very first fake-out scares.

Cat People was an instant hit, earning a reported $4m on a budget of only $135,000 (although this has been disputed, some say it was $150k). It was followed by a sequel, The Curse of the Cat People, in 1944. More importantly, Lewton would go on to produce many other films in the same style, including I Walked with a Zombie (1943) and The Seventh Victim (1943). Each relied on intimate, ordinary settings and a minimalist approach to horror. Though he worked with several directors, including Mark Robson and Robert Wise, his films maintained a uniform vision. He was a rare auteur-producer.

Yet some critics were reluctant to embrace the new horror wave. Bosley Crowther at The New York Times decried Cat People as “tedious and graphically unproductive”. It took distance and years of re-evaluation for it to be appreciated not only for its technical innovation but for its early exploration of the “monstrous feminine” – the horror of untethered female sexuality. Paul Schrader honed in on the theme for his 1982 remake, though he exchanged subtlety for an onslaught of tits and gore.