A movie theater projectionist and janitor is in love with a beautiful girl. The projectionist buys a $1 box of chocolates for the girl but his rival, sheik steals and pawns the girl’s father’s watch for $4 and buys a $3 box of chocolates for her. When the father notices that his watch is missing, the projectionist, studying to be a detective, offers to solve the crime, but when a compromising pawn ticket is found in his pocket, he is banished from the girl’s home. The projectionist then sleeping dreams a theft is being committed by the villain. The girl’s father calls for the world’s greatest detective, and Sherlock Jr. arrives.