Vatican intelligence officer Father Quart (Richard Armitage) investigates a message sent to the pope about a crumbling Spanish church that "kills to defend itself." A deep conspiracy unfolds that challenges the Father's loyalty and faith.

A computer hacker penetrates Vatican security and sends an urgent anonymous plea to the pope. Handsome Father Quart, of the church's Institute of External Affairs, an arm of the Vatican intelligence, is dispatched to investigate. The message of the hacker concerns a crumbling 17th century Baroque church in the heart of Seville that apparently "kills to defend itself".