Cast 21

1. 

   Patrick Holt

   Inspector Gregory

2. 

   Emrys Jones

   Howard Rogers

3. 

   Honor Blackman

   Ann Rogers

4. Bruce Beeby

   Det. Sgt Conway

5. 

   John Horsley

   Mr. Fisher

6. Robert Perceval

   Bank Manager

7. 

   Wally Patch

   Barman

8. Frank Pettitt

   Fred (as Frank Pettit)

9. Benedicta Leigh

   Policewoman Scott

10. 

    Peter Glaze

    Station Booking Clerk

11. Vi Stevens

    Landlady

12. Howard Greene

    River Police Sergeant

13. Raymond Smith

    River Police Constable

14. Lawrence James

    Uniformed Constable

15. Reginald Hearne

    Doctor (as Reggie Hearne)

16. 

    Barry Linehan

    Forensic Chemist

17. 

    Gerry Duggan

    Norman Cole

18. Colin Rix

    Plain Clothes Detective

19. Bill Mills

    Photographer

20. Pat Shaw

    Uniformed Policewoman

21. John Tatham

    PC Barrow (uncredited)

Crew 22