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Professor Juan (Alberto Closas) is sleeping with Maria (Lucía Bosé), who's married to a rich man. After one such tryst, Juan is driving Maria home when he accidentally strikes and kills a cyclist. But Juan is at a crucial stage in his career, Maria adores her luxurious lifestyle and both lovers fear that this incident will cause a scandal that upsets their lives. They flee the scene, but Rafa (Carlos Casaravilla), one of Maria's wealthy peers, confronts the couple with blackmail on his mind. Wikipedia