A rich but miserly old man taunts his relatives about who will get his money when he dies, and is soon mysteriously murdered. It turns out that he has left his estate to a beautiful young actress whom the other relatives didn't know was related to him. Several attempts on her life are thwarted by a detective, who sets out to discover who's behind the scheme to kill her.

A crime reporter begins to investigate the disappearance of his bosses wife who had witnessed a murder.

The ship-owner Herr Reeder Roberts organizes a world trip on his luxury liner "Yoshiwara". Aboard are millionaires and famous artists, but also criminals. The manager of the ship-owner, Stefan Martini, has been murdered shortly before the departure in a mysterious way. Several persons are suspected and these are, precisely, the passengers of the "Yoshiwara".