Lamont Cranston assumes his secret identity as "The Shadow", to break up an attempted robbery at an attorney's office. When the police search the scene, Cranston must assume the identity of the attorney. Before he can leave, a phone call summons the attorney to the home of Delthern, a wealthy client, who wants a new will drawn up. As Cranston meets with him, Delthern is suddenly shot, and Cranston is quickly caught up in a new mystery.

Afraid of marriage, Simone (Mary Ellis) breaks off her long term engagement with her fiancé Paul de Lille (Tullio Carminati). Paul heads to the top of The Eiffel Tower with thoughts of suicide. In another part of Paris and also afraid of marriage, Mignon (Ida Lupino) breaks it off from her young lover (James Blakely). Despairing, Mignon also climbs to the top of the The Eiffel Tower intending to leap to her death. There she meets Paul and the two compare stories. After discussion, Paul dissuades her from leaping and the two conspire to make their respective partners jealous by pretending to have an affair with each other.