In Vienna, Dr. Franz Braun (Monte Blue) and his wife, Charlotte (Florence Vidor), are exceptionally happy in their marriage -- until Charlotte's best friend, Mitzi (Marie Prevost), starts flirting with Franz. Mitzi's suspicious husband, Professor Josef Stock (Adolphe Menjou), hires a detective to investigate her infidelities, and the inquiry soon begins to focus on Franz. Meanwhile, Franz's business partner, Dr. Gustav Mueller (Creighton Hale), hopes to comfort the disconsolate Charlotte.