This tale of intrigue finds Valentina Cortese involved in an assassination plot. She helps the police apprehend the conspirators after an innocent bystander is accidentally killed.

Valentina Corteseas Maria Brentano / Brent / Lena Collins
Serge Reggianias Louis Balan
Audrey Hepburnas Nora Brentano
Megs Jenkinsas Penny
Irene Worthas Miss Jackson
Reginald Tateas Inspector Eliot
Simone Silvaas Undetermined (Minor Role - Paris Sequence) (uncredited)