August 23, 1939. Hitler and Stalin shock the world by signing a non-aggression pact. At that very moment, an Estonian agent is murdered and a Soviet source claims that there’s a traitor in their ranks.
Feliks, an Estonian spy in Helsinki, will be assigned to catch the traitor. He finds out that the Red Army has kicked off an operation Volcano to annex Estonia. But Feliks is also burdened by a secret regarding his Polish lover Maria who commited suicide in GRU prison two years earlier.