Discovering the KGB is one-step ahead, Joe tries to convince the team to run a double agent scheme - a perilous game that understandably makes his colleagues uneasy. But with dangerous assassin Odin at large, the team is unsure KGB defector, Arkady, would risk his life to help them. Meanwhile, Alan grapples with a shocking discovery that could jeopardize his marriage to fellow agent and wife, Sarah.

In the secret world of espionage, the players are set and the fight to save Britain begins. A complex invisible war is being fought by skilled spies trained in the high stakes world of covert espionage. In 1972 London, tensions are at a terrifying peak as the world's super powers plot against their enemies. The threat: a dangerous and deadly Soviet plot, designed to bring Britain to its knees, dubbed Operation Glass. This is where The Game begins – a stylish, character-driven spy drama that explores the lives and lies of the invisible soldiers fighting a secret war.