December 1984. SIS field asset Heidi Sperling [codename Thistle] exfiltrates from East Berlin with the sole copy of a critical intelligence leak: a naval log containing a solitary message received from a previously unidentified Soviet submarine.Incredulously – impossibly – it seems the vessel, known only as TK-15, has been sitting motionless and undetected in the waters between Scotland and Iceland for three whole years. And now this latest message reads: ACTIVE.Picked up by ...
