The last time Jonah saw Nor ed'Din, he was lying face down in a pool of icy water in the Khyber Pass. For many years, Jonah had been under the impression that he'd killed him there.

Jonah: an undercover operative for one of Britain's most secret agencies

Nor: the agent he befriended, recruited, then left for dead

Miranda: the woman he thought he loved enough to give up everything for

How far can loyalty be stretched before it reaches a limit? Millions of lives depend on the answer, as a twisting road of betrayal and revenge leads from the mountains of Afghanistan to the heart of London . . . and a ticking bomb.