Suffering short-term memory loss after a head injury, Leonard Shelby (Guy Pearce) embarks on a grim quest to find the lowlife who murdered his wife. To carry out his plan, Shelby snaps Polaroids of people and places, jotting down contextual notes on the backs of the photos to aid in his search and jog his memory. A gritty, complex thriller, Memento packs more knots than a hangman's noose.