Nikolai Khokhlov was a Soviet war hero and agent selected for a dangerous mission: kill a Russian dissident in Frankfurt, West Germany. Khokhlov went to Frankfurt as ordered, but his actions there shocked his superiors in Moscow, and opened a new chapter in the Cold War.

Former GRU Colonel Sergei Skripal was living a quiet life in Salisbury England when some of his old colleagues came calling in March 2018. He had earned the ire of Vladimir Putin years earlier, and Putin was not one to forgive or forget his enemies.