Soon after wealthy idler Jack Merrill is convinced by his doctor to get involved in some activity to fight off his ennui, he discovers that his valet Thompson has been masquerading as Lord Sidney at the home of Mrs. Parkin. Jack goes to a reception there in the guise of a British earl and discovers that most of the guests are also fakes. Mrs. Parkin has put her brother, Mr. Remwick, in an insane asylum in order to gain control of his estate, but Remwick escapes and meets up with his daughter Jane who is Mrs. Parkin's secretary. Jack offers to help them open the safe that contains a receipt implicating asylum professor Frank Blight in the plot. Remwick and Jane drive off to his apartment pursued by Mrs. Parkin and the asylum guards. Jack follows in another car and notifies the police who rescue Remwick. The receipt proves Remwick's sanity and his sister's guilt. Jack wins Jane's affections.