The body of a naked man tied to a bed appears in a roadside motel. Sergeant Ruben Bevilacqua (Vila) and his colleague Virginia Chamorro assigned to investigate the case, which is especially delicate because Trinidad Soler, the dead, is a nuclear engineer and have sparked alarmist speculation in the press.

A Sergeant of the Civil Guard and his subordinate are tasked to reopen the inquiry on the death of a young man in a Canary Island. The last person who saw him alive, a corporal of the Civil Guard, will help them to clarify the case.

After getting into a minor traffic accident, Pablo attempts to make light of the situation by asking the driver of the other car, Sonsoles, out on a date. When she refuses and instead files an injury report, Pablo snaps and begins stalking her. He soon discovers that Sonsoles has a beautiful teenage sister, Maria, with whom Pablo is immediately infatuated -- a lust that soon turns dark. Can Pablo control his obsession, or will it consume him?