Johnny Ginsberg, a tailor's apprentice who aspires to be a famous magician, joins a carnival troupe that stops in the town and doubles for sideshow attractions. The troupers, actually a gang of thieves, direct their chimpanzee to pick the pockets of Sam Hubert, a theatrical magnate who is in the audience, but Johnny recovers the wallet. Sappho, an Oriental dancer, learning that Hubert has purchased the Russian crown jewels, vamps Johnny into taking her to his home; and with the aid of the gang, she steals the jewels. Overhearing the gang quarreling over the spoils, Johnny tries to make a getaway with the gems, knocking out each member of the gang separately and affixing to each of them a tag signed "Ginsberg the Great." Hawkins, a newspaperman, publicizes the event, and Johnny consequently receives a reward and a contract from Hubert.