Captain Tom Larring barely escaped alive from a mission in Afghanistan. He now has another task. Effi Miani has been undercover in the Middle east but is needed for the same operation. Together they must find Bravo-One-One who is the highest priority target for MI6. He is believed to be building a chemical weapon in Northwest Pakistan. A previous MI6 operation has already failed. A leak or a traitor inside MI6 may have destroyed that mission, so extra precautions must be taken otherwise, this team will also fail.
Tom and Effi need a faultless back story before embarking on their mission. The operation needs financing and a cover story. The help of a former disgraced MI6 officer, Michelle Houston, and her lover, Hugh Turnbill, is sought. They successfully control the laundering of black funds for the security services whilst sailing clear of the security services. Some of the MI6 leadership wants to gain direct control of the money and the couple, despite previous agreements. They want that control regardless of the risks to the operations in Pakistan. They think they may get leverage using two former teenage runaways connected to the couple.
The hunt for whoever leaked the information continues. Suspicions are raised. The internal security team needs to prevent the traitor putting the financiers and the operation at risk. An MI5 team is on the trail of a suspicious Saudi diplomat. He may be connected to Bravo-One-One.
Closed missions should not be re-opened. The NSA and GCHQ are monitoring and tracing communications using secret programmes and techniques, but some secrets should not be shared with allies.