El cos de l'inspector Clamart flota al Sena amb una bala al clatell. Estava a punt de rematar una investigació important. Els seus col·legues reprenen la pista.

The story is about a drug ring and the finally successful efforts of the Paris police to break it up. A young detective goes into a den in Paris' Chinatown, following a clue, and that is the last seen of him until his body is found floating in the Seine several days later. The only clue is a woman's glove. The dead man's friends on the force vow to avenge him, and receive information leading them to suspect one Sandra, a beautiful foreigner, played by the stunning Marcelle Chantal.

Le corps de l'inspecteur Clamart flotte sur la Seine, une balle dans la nuque. Il était sur le point de boucler une enquête importante. Ses collègues remontent la piste...