This series is born from the homonymous program of Catalunya Ràdio that explains real crimes in Catalonia in a novel way. Now its television version arrives on TV3. It is the first true-crime series of the network.

Carles Porta, director, and presenter of the radio program, also presents the cases on television from the Catalunya Ràdio studio with a brief introduction before giving way to each chapter. His voiceover accompanies the whole plot. Crims has 11 chapters. Each episode shows 7 recent cases. Each one has had an important impact on the media. Ant they are part of the viewer's imagination. Real cases such as Brito and Picatoste, the warden of Olot, the librarian Helena Jubany or the killer of Putxet, among others, explained with fictional elements and resources.