William Jameson engages Bryce, a detective, to investigate several mysterious robberies which have occurred in one of his stores. Suspicion is thrown by Guy Manse, the manager, upon Jack Kent, a young clerk, whose duty is to open and close the safe, and with Manse's help the detective manages to entrap the clerk and secure evidence against him. Kent is sent to jail. Mary Ball, his sweetheart, alone believes in his innocence. Also, she is conscious that Manse covets her. She watches the manager closely, and one day sees him drop a pawn ticket. Quickly she notes the number and name of the pawnbroker. The manager recovers the ticket without knowing that he has betrayed himself. Mary locates the stolen jewels and puts the detective upon the right track. Kent is absolved and the manager punished.