César (Eduardo Noriega) is a rich womanizer who prowls the parties and bars of Madrid, intent on bagging chicks. But when César falls for the beautiful Sofía (Penélope Cruz), he's the one who's bagged. After he is placed in a psychiatric penitentiary for a murder he does not remember committing, his only hope is to delve into the depths of his subconscious mind where the answer to ending his living nightmare lies in his dreams.