The beautiful Nina's work is unique. On behalf of suspicious women, she tests the fidelity of their men, provocatively and in disguise with advances aimed at verifying their loyalty. To date, her practice holds a record of 100% of men being unfaithful! A new client wants to test her future husband, Matteo, the owner of a small publishing house, a charming, interesting, and intelligent guy. Nina points at him, certain that he will fall like the others, at the speed of light. But he resists. The idea that there's an exception to the 100% rule unsettles Nina, so she persists. So, while he risks giving in to the pressure of desire, she exposes herself to the danger of falling hopelessly in love with a man faithful to someone else, sinking into the very chaos of emotions she'd always avoided!