1984. The Oberbaum Bridge. The Stasi apprehend an MI6 agent attempting to exfil information vital to British interests in a divided Germany. Thirty-four-years later, each of the retired SIS officers attached to the failed operation are targeted for assassination by a former KGB head of station and once rising star in the Russian FSB. Banastre Montjoy, deputy chief of England’s Secret Intelligence Service, must go underground in search of answers, a journey that will take him across Europe and into his past. One that will also lead the master spy to the most guarded secret in American Cold War Intelligence. The CIA mole in East Berlin.