Sherlock Coco, famous detective, tries to thwart the machiavellian plans of the trio of shock. Croquignol, Ribouldingue and Filochard must be extra vigilant, but the profit motive is too strong. As a corollary, the famous pink diamond is also of interest to their legendary enemy, Jo Papillon. But always inventive, they will work out multiple scams and tricks to reach their goals.
| Actor | Role |
|---|---|
 RellysCroquignol | Croquignol |
 Robert DhéryFilochard | Filochard |
 Maurice BaquetRibouldingue | Ribouldingue |
 Fred PasqualiSherlock Coco | Sherlock Coco |
 Luc AndrieuxHector | Hector |
 Colette BrossetIrène | Irène |
 Claire GérardThe princess | The princess |
| MMarion TourèsHélène | Hélène |
| MMadeleine LemaîtreA washerwoman | A washerwoman |
| DDorette ArdenneThe innkeeper | The innkeeper |
| JJacques SommetPierre-Jo | Pierre-Jo |
 Maxime FabertDubarreau | Dubarreau |
| FFernand GilbertBébert | Bébert |
 Christian DuvaleixA mobster | A mobster |
 André NumèsA guardian | A guardian |
| RRoger RafalA mobster | A mobster |
| JJacques EmmanuelA mobster | A mobster |
| LLucien HectorThe Brigadier | The Brigadier |
 Jean Le PoulainNot listed | Not listed |
| AAntonin PrioletNot listed | Not listed |
 Gérard SétyNot listed | Not listed |
| PPierre MéréNot listed | Not listed |
 Lisette LebonNot listed | Not listed |
| RRoger SagetA mobster | A mobster |