Margaret Rutherford
Miss Jane Marple
Miss Jane Marple (Dame Margaret Rutherford) investigates the murder of one of her fellow trustees of a fund which rehabilitates young criminals. To investigate she goes aboard the ship used to train the juveniles, much to the distress of Captain Sydney De Courcy Rhumstone (Lionel Jeffries). She soon stumbles onto more murders, and a ring of thieves.
Miss Jane Marple
Captain Rhumstone
Inspector Craddock
Breeze-Connington
Alice Fanbraid
Jim Stringer
Dr. Crump
Bishop
Lord Rudkin
Sub-Lt. Eric Humbert
Brewer
Asst. Matron Shirley Boston
Sgt. Bacon
Lt. Compton
Millie
Dusty Miller
Tramp
Miss Pringle
Petty Officer Lamb
Police Constable (uncredited)
Director
