Teo, a private detective, never decides to heed his fiancée Sonia's requests to abandon his dangerous profession and go work for her father, a wealthy industrialist. A new case always comes up, causing Teo to postpone his visit to his future father-in-law. However, one day he is hired under mysterious circumstances: he receives orders from a woman he doesn't know to do something that is still unclear. Nevertheless, the woman pays him handsomely and gives him a vague idea of the case. To his surprise, as soon as the woman leaves, Teo is attacked by four men. Recovering from his injuries, he begins to investigate his client...