Casts
Terence Longdon
as Mark Robert Kingston
Donald Gray
as Inspector Wills
Diane Clare
as Mary Johnson
Robertson Hare
as Ronald Fortescue
Dermot Walsh
as Prof. Henry Taylor
Jill Hyem
as Joy Clark
Felicity Young
as Jill
Douglas Muir
as Detective Sergeant Willoughby
Edwin Styles
as Sir Lionel
