Dr. Fausto (Miguel Ángel Solá), a specialist in terminal medicine, spends most of his waking hours treating patients on the brink of death. So wrapped up in the routine of his soulless work he has become a man without dreams - a man closer to death than to life. On his way to attend a medical conference in Barcelona, Dr. Fausto meets the mysterious Santos Vella (Eduard Fernández), a man who claims to have once been a patient who Fausto had given up for dead eight years ago following an operation to remove his stomach.

Shocked by the man's story of survival, Fausto has no memory ever having known him. As exasperating as he is charismatic, and despite the doctor's protestations, Santos soon becomes Fausto's guide during his stay in the city, introducing the jaded doctor to the unbridled pleasures and experiences of life, at the same time promising to grant him anything he desires. Unable to resist the offer, Fausto embarks on a fantastic and terrible journey into the long-forgotten depths of his own soul.