- Writer:
- Francis Durbridge
- Production:
- Martyn C. Webster
- An Editor:
- Dick Francis
- Rex Bryant, a reporter:
- Ivan Samson
- Paul Temple:
- Hugh Morton
- 'Steve', his wife:
- Bernadette Hodgson
- Dr Ludwig Steiner:
- Maurice Denham
- Pryce:
- Clifford Bean
- Iris Archer:
- Diana Morrison
- Sir Graham Forbes of Scotland Yard:
- Lester Mudditt
- Mrs Moffat:
- Mary O'Farrell
- David Lindsay:
- Geoffrey Wincott
- Laurence van Draper:
- Norman Shelley
- Major Guest:
- Cyril Nash
- Mrs Weston:
- Audrey Cameron
- Ernie Weston:
- Dick Francis
