Paul Morgan embarks on a personal mission to discover the identity a Soviet mole. Paul and his wife Gina move into their Highgate home, once an MI5 safe house. They find a bullet embedded in a wall. It leads to unveiling an MI5 operation to extract KGB defector Colonel Zavrazin from East Berlin 50 years earlier. Zavrazin carried a dossier unmasking a top Soviet spy, code name Arrow Eye. After a firefight at the safe house, the dossier went missing.Paul becomes obsessed with tracking down the dossier and finding Arrow Eye's identity. After a breathtaking set of events involving foreign agents and MI5, Arrow Eye's true identity is revealed.