Four people go to great lengths to obtain the fortune left in a will by a very wealthy practical joker.
| Actor | Role |
|---|---|
 Ronnie CorbettHerbert Russell | Herbert Russell |
 Thora HirdAgnes Russell | Agnes Russell |
 Michael HordernDenniston Russell | Denniston Russell |
 Barbara MurrayLucille Grayson | Lucille Grayson |
 Leslie PhillipsSimon Russell | Simon Russell |
 Dennis PriceBenson | Benson |
 Wilfrid BrambellHenry Russell | Henry Russell |
 James Robertson JusticeSir Charles Robson | Sir Charles Robson |
 Sheila SteafelSheila Wilcott | Sheila Wilcott |
 Eleanor SummerfieldElizabeth Robson | Elizabeth Robson |
 Arthur LowePolice Sergeant | Police Sergeant |
 Noel DavisStewart | Stewart |
 Toni GilpinMiss Heath | Miss Heath |
 Harold GoodwinWilliams | Williams |
 Noel HowlettEndicott | Endicott |
 Diana KingMrs Craik | Mrs Craik |
 Stephen LewisPolice Constable Arthur | Police Constable Arthur |
 Norman MitchellPoliceman | Policeman |
 John NettletonWagstaff | Wagstaff |
 Brian OultonMr Dale | Mr Dale |
 Toni PalmerKitty | Kitty |
 Frank ThorntonPurvis | Purvis |
| DDavid LanderRicci | Ricci |
| RRobin TolhurstLettie | Lettie |
 Vicki WoolfJanine | Janine |