Elvira, an ambitious journalist and a writer of modest success, is approached by a disturbing figure, Martín, who presents her with a chilling proposition: she could finally attain the success she craves by writing a book about Martín’s extraordinary gift… that of being the greatest killer in History.

Under the enamored gaze of Thomas, her editor — a man facing his last chance to win her heart — Elvira’s decision forces them all to confront their own ethics, face pure, unfiltered horror, and uncover the true nature of evil.