Rendlesham Forest. 1980. Personnel from the nearby US Air Force base investigate unusual lights in the surrounding forest. They later make extraordinary claims about what they had seen. London. 2020. Alex Grant, ex SIS and Security Service operative, is handed a routine investigation. He soon finds he has wandered into the middle of the Cold War equivalent of a long abandoned minefield. What links the two events, forty years apart? What secret that old is worth killing to keep? To find the answers, Grant dusts off the skills he had hoped he no longer needed and finds himself back in a world where the virtue of allies is worth no more than the duplicity of enemies and where there is no way to tell one from the other.