Mary Clare as Mrs Pym

Nigel Patrick as Richard Lodden

Irene Handl as Miss Bell

Edward Lexy as Det-Inspector Shott

Janet Johnson as Maraday Wood

Anthony Ireland as Henry Mencken

Robert English as Commissioner of Police

Arthur Ridley as Divisional Surgeon

Vernon Kelso as Frank Wood

Lionel Dymoke as Assistant Commissioner

Ben Williams as Detective-Constable

Arthur E. Owen as Hall Porter

Jack Jameson as Clerk from Criminal Record Office

Joan Halladay as Eliza Puttick