It's an indecently gripping movie, undeniably about colonial guilt and the legacy of the Algerian War. But, equally, by the film’s closing credits multiple questions remain.

Austrian sadist Michael Haneke's most mainstream film to date is this exquisitely calibrated and jittery thriller.

Contrarian that he is, Haneke does a much finer job forcing questions than providing an answer.

Caché is not a movie you simply like or hate. It makes you question yourself, your own memories, and the purpose of genre as a whole.