Frank Briers – Peter Stansfield
Lady Ashbrook – Pam Milnes
Doctor Perryman – Roland Coombs
Loseby – Nick Pennington
Susan Thirkill – Lucy Blowers
Humphrey Leigh – Michael Millward
Sergeant Tanner – John Burgess
Chief Inspector Rees – Robert Shaw
Inspector Shingler – Guy Wilman
Professor Morgan – Edward Cowen
Maria – Elisabeth Nott
Police Photographer – Anthony Calvert
Stenographer – Rosalind Fairclough
Policewoman – Judith Charnley