The Unknown review – Léa Seydoux gets invaded in uncanny and bizarre body-swap horror

Cannes film festival: A man is terrified to wake up in Seydoux’s body in this metempsychotic mystery film about gender identity

Arthur Harari’s film is adapted from a graphic novel he wrote with his brother Lucas called The Case of David Zimmerman. It is a doomy, murky and intriguing supernatural noir mystery, hardly visible within the dark toxic cloud of its own strangeness, populated by people bearing stricken expressions of misery and fear. There are some genuinely uncanny and disquieting moments. Maybe it is a parable for the crisis of gender identity – or just identity, and everyone’s occasional experience of the profound, unreconcilable unknowability of our own bodies. There is also something of the mood of Blow-Up, or Basil Dearden’s Brit pulp chiller The Man Who Haunted Himself, or indeed David Robert Mitchell’s modern classic It Follows. But this one, sadly, is flawed by that perennial problem of how to end a story with a great premise.

Niels Schneider plays David Zimmerman, a photographer in his late 30s documenting the way in which his home town has changed over the past century – a project inherited from his photographer dad. (He has an old photo of them both seated on the pavement, apparently mimicking Chaplin and the Kid.) David is overworked, dishevelled and depressed, but is just about persuaded to go along to a raucous New Year’s Eve party where he is stunned to glimpse a woman staring at him, played by Léa Seydoux, whom he realises he photographed a few months’ previously.