Wilkes is the owner of a department store from which a great many things have been stolen, and he tells his manager that it has got to stop. He notifies the famous detective, Potts, who comes to the store to investigate. Potts arrives at the store, and after several mistakes gets to work to find the thief. In the meanwhile Elsie, the boss's daughter, who is a kleptomaniac, arrives and asks Eddie, the manager, to show her some necklaces. When his back is turned she gently slips one of them into her pocket, but Potts sees it and takes both her and Eddie before Wilkes. But on the way up Elsie manages to slip the necklace into Potts' pocket. Potts finds it and is terrified to think that they may accuse him. So he, in turn, slips it into Eddie's pocket and Eddie gives it to the old man. Then Elsie confesses her weakness, and when the old man finds the jewels in his pocket he thinks that, as he does not remember them, the disease must run in the family. So Eddie marries Elsie to take care of her, and Potts is engaged as a permanent caretaker for Wilkes.
—Moving Picture World synopsis