Lucas is a young scientist obsessed with the analysis of movement: that of the horses he studies in his laboratory, that of the clappers he practices as an amateur. His professional and sentimental life seems like a stalemate when his brother Luigi, a passionate horse breeder and little crook,who is accidentally killed by a stallion, Mister V. He knows that the animal is the subject of an insurance scam and must be shot against the will of his brother, who had seen in him a future champion. He then decides to take care of the farm and his sister-in-law, for whom he has always had an attraction. Tugged between his feelings, Luigi's memory and the pressures of the former crook partner, he will draw strength and power from the murderous stallion whose savagery fascinates him.