The brilliance of the film comes more from Polanski's direction, and from a series of genuinely inspired performances, than from the original story.

Rosemary’s Baby is one of horror cinema’s all-time slow burns, drawing viewers gradually into entertaining the possibility that the movie’s series of strange coincidences and accumulating sense of dread are only subjective representations of Rosemary’s unraveling mental state.

As Polanski leads the audience step-by-step through Levin’s queasy plot, he pushes them toward a conclusion straight out of a Louvin Brothers gospel song. Oh yes, brethren: Satan is real.

This is horror rooted not in misty Carpathian castles, but in recognisable modern life, with the satanists depicted not as outlandish fiends but the sort of everyday folk you might encounter on any urban street.

A supremely intelligent and convincing adaptation of Ira Levin's Satanist thriller.