Riuscirà il nostro eroe a ritrovare il più grande diamante del mondo?

Jimmy Logan, a detective, tries to retrieve a diamond from the British crown stolen by the traitorous chief of the English Secret Service. After carrying out dangerous investigations at Montecarlo, Beirut and Hamburg, he discovers that the headquarters of the thieves is located in a mental hospital and sets about infiltrating their ranks.

Cast

Ray Danton

Agnès Spaak

Tiziano Cortini

Luciana Gilli

Monica Pardo

Pamela Tudor

Daniele Vargas

Francesco Mulè

Gioiella Minicardi

Seyna Seyn

Andrea Aureli

Fortunato Arena

Mirella Pamphili

Carlo Pisacane

Pietro Tordi