Jillian likes her job as a signals intelligence officer intercepting German communications. Even though she works undercover in West Berlin during the height of the Cold War, it is safe, predictable — boring even. All that changes when her lover turns out to be a Cuban spy of interest to the CIA, and her only friend, a Canadian diplomat, shows up on the other side of the Wall with a different identity.

Jillian is alone and scared. If her cover is blown her life is in danger, but the intercept she is collecting is too important to just abandon her assignment.

So she begins two uneasy alliances. One, with a CIA officer named Quentin, in which her only currency is her relationship with the Cuban, and two, with a British military captain, James, there to report on Jillian's activities to her boss. At first concerned only with her own safety, she learns that her diplomat friend is in serious trouble, and Jillian must decide how much she is willing to risk to save both her friend and herself.

She suddenly finds herself thrust into the middle of an intricate web of cover-ups, lies, and espionage. Unable to trust anyone, and completely out of her element, Jillian must use her wits to survive playing a spy game that has no rules.