From the case files of Scotland Yard, detectives investigate the mysterious death of Peter Adams, artist and possible forger.
| Actor | Role |
|---|---|
 Edgar LustgartenPresenter | Presenter |
 Russell NapierInspector Duggan | Inspector Duggan |
| VVernon GreevesSergeant | Sergeant |
 Carl JaffeNicholls | Nicholls |
 Sylvia MarriottJanet Nicholls | Janet Nicholls |
 Roger DelgadoCommissario | Commissario |
 Dino GalvaniDirector of Cellini Gallery in Rome | Director of Cellini Gallery in Rome |
| AAlec FinterDoctor Harding | Doctor Harding |
| JJoan CrossMaid (Nancy Morgan) | Maid (Nancy Morgan) |
 Glyn HoustonBates | Bates |
| MMargot BryantMrs. Bailey | Mrs. Bailey |
| BBarbara BruceMrs. Wiggins | Mrs. Wiggins |