A Scottish professor is drawn into a world of espionage.
Aired on BBC Radio (Home Service Basic) on 1 May 1954.
Producer: Martyn C. Webster.
Cast members included William Fox (Assistant Commissioner Morley), Deryck Guyler (Detective Inspector Clavering), Gladys Spencer (Lady Blanchard), John Ruddock (Sir Brian Fordinghame), Ivan Samson (Sir Gilbert Mildmay), Malcolm Graeme (Sir Hector Panderville), Jerry Stovin (Clark Hungerford), Richard Bebb (Gerald Leicester), Denise Bryer (Judy Farrell), Geoffrey Matthews (Tom Farrell), Elizabeth Maude (Betty Sloane), Derek Hart (George Brook), Mary Wimbush (Vania Deane), James Dale (Sir Ronald Luke), and Emrys Leyshon (Loetz).
(Production details via Radio Times, 4 June 1954, p.28.)