The latest round of Middle East peace talks are abruptly halted when a key delegate is killed. With the peace process derailed, MI5 investigate a newspaper mogul and renowned Israeli extremist.

Zoe is caught up in the deadly fallout of an abortive mission and must stand trial for conspiracy to murder. Can an MI5 officer be culpable for the death of an undercover police officer, killed by a member of a Turkish gun-running gang?