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.

Lucas, jeune scientifique, est obsédé par le mouvement ; celui des chevaux qu’il étudie, et celui de la danse qu’il pratique en amateur. Sa vie sentimentale et professionnelle atteint une impasse lorsque son frère Luigi, éleveur de chevaux, meurt, tué accidentellement par un étalon, Mister V. Fasciné par Mister V., Lucas sait que l’animal a fait l’objet d’une arnaque aux assurances et qu’il doit être abattu.