Un killer astuto e spietato sta uccidendo a raffica, nei modi più raccapriccianti, personaggi scelti con cura. Sulle sue tracce ci sono il giovane e ambizioso Mills, alla prima missione, e l'esperto Somerset, ormai prossimo alla pensione; personalità opposte che mal si tollerano a vicenda. Imparano a "convivere" man mano che la caccia all'assassino si fa più serrata e il mistero comincia a districarsi: il mostro sceglie le vittime e le uccide seguendo i sette peccati capitali (gola, avarizia, accidia, lussuria, superbia, invidia e ira).

Humble and introvert Muharrem lives in a solitary and meager existence of a prayer and sexual abstinence adhering strictly to the most severe Islamic doctrines.His extraordinary devotion attracts the attention of the leader of a rich and powerful Istanbul religious group and he offers him an administrative post as a rent collector for their numerous properties. Muharrem's new job throws him into the modern outside world he has successfully avoided for so long. He soon witnesses conflict attitude toward alcohol consumption and goodwill.He notices that he himself has become proud, domineering and even dishonest.To make matters worse, Muharrem's inner peace is unnerved by the tormenting image of seductive woman who tempts him in his dreams,both night and day.With the balance of his devotion now upset,his fear of God begins to eat away at his senses.