Sally Gray as Nurse Frederica "Freddi" Linley Trevor Howard as Dr. Barney Barnes Rosamund John as Nurse Esther Sanson Alastair Sim as Inspector Cockrill Leo Genn as Dr. Eden Judy Campbell as Sister Marion Bates Megs Jenkins as Nurse Woods Moore Marriott as Joseph Higgins (the postman) Henry Edwards as Mr. Purdy Ronald Adam as Dr. White George Woodbridge as Detective Sergeant Hendricks Wendy Thompson as Sister Carter John Rae as the porter Frank Ling as rescue worker