A London solicitor and a French detective investigate the mysterious death of an elderly woman suspected of being poisoned.
Oskar Homolka
as Inspector Hanaud
Robert Urquhart
as Jim Frobisher
Yvonne Furneaux
as Betty Harlowe
Josephine Griffin
as Ann Upcott
Harold Kasket
as Boris Wabersky
Ruth Lodge
as Nurse
Pierre Lefevre
as Detective Maurice Thevenet
Pierre Chaminade
as Detective Moreau
Jacques Cey
as Police Commissaire Giradot
Anthony Nicholls
as Lawyer Jarrett