The Mysterious Club

Gerhard Bern hears from Rotterdam that his brother has killed himself, with no reason given except membership in a secret club. Gerhard and a detective go to Rotterdam and stay with Consul Verstraaten, a friend of Gerhard's father. Gerhard falls in love with the consul's daughter Ilse, and they become engaged. Another member of the club then dies. Both dead men had taken out life insurance, and Mr. van Gelderen, the club's leader, has collected the money.