When an elderly Russian is burned to death in his car in north London, his 72-year-old friend, former KGB man Nikolai Volkov, determines to avenge his death. In the days that follow, the British Prime Minister goes missing; a wealthy Russian crime boss is mysteriously poisoned in Britain's most secure prison, and the body of a youth is found at one of the UK's most secret Ministry of Defence bases. Meanwhile, a drone attack is mounted on MI6's...