Fermat’s Room is an ingenious Spanish thriller

Four brainy people, all with something to hide, find themselves in a deserted house, faced with a string of riddles.

Are they part of a game or is something more serious at stake? It’s all very gripping and beautifully acted. When the "mastermind" is unmasked, however, you realise none of it hangs together.

(And don’t spend too long brooding on the riddles. They’re called brain teasers for a reason.)

Fermat's Room