The final heart-pounding novel in the sensational Child 44 trilogy, from bestselling author Tom Rob Smith.

Leo Demidov is no longer a member of Moscow's secret police. But when his wife, Raisa, and daughters Zoya and Elena are invited on a "Peace Tour" to New York City, he is immediately suspicious.

Forbidden to travel with his family and trapped on the other side of the world, Leo watches helplessly as events in New York unfold and those closest to his heart are pulled into a web of political conspiracy and betrayal—one that will end in tragedy.

In the horrible aftermath, Leo demands only one thing: to investigate the killer who destroyed his family. His request is summarily denied. Crippled by grief and haunted by the need to find out exactly what happened on that night in New York, Leo takes matters into his own hands. It is a quest that will span decades, and take Leo around the world—from Moscow, to the mountains of Soviet-controlled Afghanistan, to the backstreets of New York—in pursuit of the one man who knows the truth: Agent 6.