Returning from Moscow, Lorenzo Rossi finds himself forced to quit his job as head of the Vatican police. And to make matters worse, his fiancée, CIA Agent Cathy Doherty, calls off their wedding. Just as Rossi is settling into his new life as a visiting academic at Cambridge University, the CIA persuades him to rejoin Cathy in catching the killer of three American billionaires. Barely on speaking terms, the two devise a plan to befriend the CIA’s main suspect.

As they get closer to the suspect and his coterie of friends, Rossi and Cathy realise that they’re being played for fools. But why? Everything points to an international conspiracy. As friends and foes drop dead around them, they arrive at the truth. But to prove it they need to set a trap. A trap that turns them from hunter to prey. Will they survive to tell their tale?