Canio and his Comedia dell'Arte troupe tour Italy. His wife Nedda meets a young cadet and they plan to elope. He tries to leave her when he finds how important she is for his husband, but a rejected trouper interferes. As jealous Canio suspects the truth the tragedy approaches. The film was partly made in Ufacolor.

During WWII several murders occur at a convalescent home where Dr. Watson has volunteered his services. He summons Holmes for help and the master detective proceeds to solve the crime from a long list of suspects including the owners of the home, the staff and the patients recovering there.