In this silent 1924 comedy classic, Buster Keaton plays a kindly movie projectionist who longs to be a detective. When his fiancée is robbed by a local thief, the poor projectionist is framed for the crime. Using his amateur detective skills, the projectionist follows the thief to the train station—only to find himself locked in a train car. Disheartened, he returns to his movie theater, where he falls asleep and dreams that he is the great Sherlock Holmes. While he is sleeping, his fiancée does her own detective work.