Betrayal

When MI5 operative John Hughes meets with a British-Iranian informant who claims to have intelligence about a threat to national security, the informant is killed before he can talk - John, in self-defence, shoots the assassin dead. John is chastised by his boss Simone, who warned him not to follow that lead - all evidence points towards the informant's death being a gangland dispute.

John is still reeling after his discovery that a proxy attack is possibly being planned on UK soil to target a prominent Iranian dissident - when a visit to John's informant's widow throws up contradictory evidence, John becomes convinced that there is a cover-up which permeates to the highest level. Meanwhile, John's refusal to accept voluntary redundancy means that his relationship with Claire is on thin ice.

John and Mehreen recover from their stand-off with Major General Qasem Asadi and the Stockport crime gang - with MI5 now finally on his side, John tracks the general to a high-end hotel. John and Mehreen must go undercover to uncover whether Qasem is the mastermind behind a potentially explosive threat to national security.

John must escape captivity as he races to intercept an attack at a university. But those who want the attack to go ahead will stop at nothing, threatening those John holds dearest.