I know a secret. A secret that changes everything . . .'

Solomon Vine was the best of his generation, a spy on a fast track to the top. But when a prisoner is shot in unexplained circumstances on his watch, only suspension and exile beckon.

Three months later, MI6's Head of Station in Istanbul is abducted from his home. There are signs of a violent struggle. With the Service in lockdown, uncertain of who can be trusted, thoughts turn to the missing man's oldest friend- Solomon Vine.

Officially suspended, Vine can operate outside the chain of command to uncover the truth. But his investigation soon reveals that the disappearance heralds something much darker. And that there's much more at stake than the life of a single spy . . .