An al-Qaeda suspect is killed in London, and photographs are found on his computer – photographs that lead Israeli intelligence to suspect that al-Qaeda is planning one of its most audacious attacks ever, straight at the heart of the Vatican.

Allon warns the Pope’s private secretary, his old friend Monsignor Luigi Donati, and rushes to Rome to assist in the security. But what neither he nor Donati knows is that the Vatican has been thoroughly penetrated. An extraordinary enemy walks among them … and he’s just getting started.

In the days and weeks to come, Allon and his colleagues will find themselves in a deadly duel of wits against one of the most dangerous men in the world – a hunt that will take them across Europe to the Caribbean and back again. But for them, there may simply not be enough of anything: enough time, enough facts, enough luck.

All Allon can do is set his trap – and hope that he himself is not the one caught in it.