'Rocks' Owen, the well-off owner of a car-hire business, is found murdered; the last place he was seen alive was the Blue Parrot nightclub. Scotland Yard go in to investigate, with the help of a visiting American detective and a nightclub hostess who may not be all she appears to be.
| Actor | Role |
|---|---|
 Dermot WalshBob Herrick | Bob Herrick |
 Jacqueline HillMaureen Maguire | Maureen Maguire |
 Ballard BerkeleySupt. Chester | Supt. Chester |
 Richard PearsonQuinney | Quinney |
 June AshleyGloria | Gloria |
 Ferdy MayneStevens | Stevens |
 John Le MesurierHenry Carson | Henry Carson |
 Valerie WhiteMrs. West | Mrs. West |
| VVictor LucasRocks Owen | Rocks Owen |
 Edwin RichfieldGuido "Taps" Campelli | Guido "Taps" Campelli |
| DDiane WattsCarla | Carla |
 Arthur RigbyCharlie | Charlie |
| TThomas GallagherJim - Blue Parrot Doorman (uncredited) | Jim - Blue Parrot Doorman (uncredited) |
| JJoe WadhamP.C. Jenkins (uncredited) | P.C. Jenkins (uncredited) |