When Amelie Levene, who in six weeks is due to take over as the first female Chief of MI6, disappears without a trace while in the south of France, it is the gravest crisis MI6 has faced in more than a decade. Britain's top intelligence agents turn to one of their own: disgraced former MI6 officer Thomas Kell. The trail leads Kell to France and Tunisia, where he uncovers a shocking secret and a conspiracy that could have unimaginable repercussions...

"Thomas Kell thought he was done with spying. A former MI6 officer, he devoted his life to the Service, but it has left him with nothing but grief and a simmering anger against the Kremlin. Then Kell is offered an unexpected chance at revenge. Taking the law into his own hands, he embarks on a mission to recruit a top Russian spy who is in possession of a terrifying secret. As Kell tracks his man from Moscow to London, he finds himself in a high stakes...