A man is found hanged in a pinewood on the outskirts of Madrid, his eyes torn out by the roots. In one of his pockets is a mysterious scrap of paper with thee names and the address of a woman: Sara Azcárraga, who lives a few miles from the scene of the crime. Fragile, solitary, a secret vodka drinker, Sara eschews all human contact and works from home. Civil Guard Lieutenant Julián Tresser takes over the case, assisted by the young, inexperienced captain, Coira in an investigation that is difficult, has hardly any clues and too many enigmas. As Tresser investigates, he discovers events that cause a tragic twist in his existence and take him on a journey to hell that will change his life forever.