The document provides background information on the plot of the film Memento. It begins with a summary of the opening sequences showing a man with a polaroid photo of a bloody bathroom from a killing. It then explains that the main character, Leonard Shelby, has short-term memory loss from an injury and is trying to find his wife's killer. He takes notes and polaroids to help navigate his daily life. The plot involves Leonard being helped by two people, Teddy and Natalie, but he does not remember them each time they meet.