Lorenzo Rossi, former head of the Vatican police, is enjoying the Tuscan sunshine until his ex-fiancee, CIA agent Cathy Doherty, shows up worried about his safety. Rossi is sceptical until he learns that a Russian agent with links to the CIA, crashed her car near his family's olive farm in Siena.

With the help of the Russian's associates, Rossi and Cathy unravel a conspiracy that could lead to nuclear war. With danger mounting and bodies piling up, they realise they're pawns in a deadly game...