Whenever a criminal is killed in London, a black Jaguar is nearby, with a white cat always sitting in the passenger seat. Inspector Higgins and Inspector Lane find a joker card on all the victims. Their investigation leads them to a diamond smuggling ring.
as Chiefinspector Higgins
as Inspector Barbara Lane
as Sir John
as Flatter
as Lady Smith
as Mr. Goldman
as Mrs. Goldman
as Tony Miller
as J. Carpenter
as Eugene Phipps
as Ann Pattison
as Reynolds
