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London: 1972. When a defecting KGB officer, Arkady Malinov, reveals Operation Glass, a devastating Soviet plot that could change the course of the cold war, Daddy, the head of MI5, assembles a secret team to investigate. As the Soviets awaken a list of sleeper agents all over Britain, Daddy’s team must move swiftly to gain information about the plot. But when Joe Lambe, Daddy’s prized agent, becomes obsessed with the reappearance of a dangerous nemesis, a Soviet agent codenamed ‘Odin’, he risks letting his personal vendetta jeopardize the operation.

The next agent on the Soviet list, Tom Mallory, is a brutal man currently in prison for assault. Without his freedom, he can’t perform his task and bring MI5 one step closer to thwarting Operation Glass – leaving Daddy with a terrible choice. Joe, haunted by events in his past, continues to struggle with his lover’s killer’s role in the plot. But when it’s revealed that a possible nuclear strike is imminent, Joe makes a deadly decision to stop the information from falling into enemy hands.

The team discovers a sleeper agent with terrifying connections in the US military. Faced with a formidable foe who not only appears to be a traitor, but a trained spy with access to US bases, MI5 may be out of its league. Meanwhile, Daddy is on a mission of his own to secure the safe defection of his favorite Chinese dancer. But when his assistant, Wendy, goes to carry out the admin, Bobby Waterhouse catches wind and manipulates plans to gain information about Daddy’s secret life for his own personal gain.

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. Bobby’s world begins to unravel when Daddy thwarts his attempts at ascendance and raises questions that threaten to destroy his career.

The team is reeling from the shocking discovery of a mole among them, and as the Soviet plot continues unabated, it is up to Wendy to give the team the break they need. Meanwhile, when Sarah finds herself in danger, Alan is forced to make a decision that can make or break their relationship. Joe has trouble of his own when leaked information threatens the investigation and the lives of the team.

The team is reeling from a KGB bombing and the mole’s confession, but with Operation Glass hurtling towards a shocking climax, MI5 is running out of time to piece the puzzle together and avert disaster. Bobby and Wendy make a crucial discovery which could have implications at the highest levels of government.