Vertigo to Black Swan to Hereditary. The thrillers that locate the horror inside the protagonist rather than across the room from them.
The psychological thriller is the sub-genre whose stakes are internal. The threat is not, primarily, a knife or a killer or a creature; the threat is the protagonist's own perception, memory, sanity, or identity. The genre's most-distinguished entries are the ones where the audience cannot trust what they are being shown — because the protagonist cannot trust it either.
Our picks across the genre.
The technical requirement of the psychological thriller is that the audience must, on first viewing, accept the protagonist's reading of events — and, on second viewing, see how the film has been signalling that reading was wrong. The most-respected entries deliver both viewings. Vertigo gets richer on rewatching. Get Out reveals new plant moments on every viewing. Memento gets clearer in its second pass.