Julie, a young doctor, is running late. She is about to pick up her daughter from school close to the City of London when there is an explosion. Sirens shriek. A police van tells everyone to take cover...

Meet Tony Underwood, newly retired from MI5, and Arshile Grekov, oligarch, London expat, recluse and ex-colonel in the Russian secret service. Forced by lack of money, Tony has joined his former adversary...

'Riveting and intriguing.' Jung Chang, Wild Swans. A bloody insurrection in China's turbulent New Silk Road province. The Guoanbu, the counter-intelligence agency, invites MI5 to interrogate a captured...