Macguffin, Enigmas and Red herrings
A Macguffin is plot device that motivates the characters and advances the story, but has little other relevance to the story.
Alfred Hitchcock's quote on Macguffins: " We have a name in the studio, and we call it the 'MacGuffin'. It is the mechanical element that usually crops up in any story. In crook stories it is always the necklace and in spy stories it is always the papers.
Enigma refers to a puzzle, something mysterious or inexplicable, or a riddle or difficult problem.
In thrillers, this is commonly something which the protagonist has to try to find out or solve before the narrative is resolved and the film finishes.
Red herrings is the name given to a device which intends to divert the audience from the truth or an item of significance. This can work with other devices such as enigmas to create suspense.
For example in Saw the two characters spend time imprisoned in a room in which a third character lies dead. Throughout the film, both characters appear to be guilty of a series of murders, until it is discovered at the end that the third person in the room is bot actually dead but is in fact, the killer.




