A couple in crisis: he, she and ... the other. Marco wants to leave Laura, as he is in love with Cinzia. Laura does not give up. Until one night, wandering around the house in the dark, while Marco is asleep, he hears the incessant and pounding sound of a drop. An obsession that digs her brain, while the tension rises in a crescendo of restlessness and ambiguity. Marco is dead, the sound of the drop is nothing but the flow of his blood. We understand that he was killed. It is not difficult to understand by whom. Suddenly Marco wakes up, has he perhaps dreamed? Next to him Laura's body. But the twists don't end there ...