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 for Britain and its allies.