It's 1976, the Cold War is still at its coldest, and retired agent John Dashwood is persuaded to return to supervise one last mission. However nothing at Ghost Station is quite the way he remembers it and everybody seems to have something to hide – including his two valued colleagues, Rick Wentworth and Harry Tilney, and his enigmatic boss Sir Charles Grandison. When operational necessity requires Dashwood to send Rick and Harry into a dangerous situation, the boundaries between friend and enemy begin to blur and he's left isolated and wondering which of his so-called allies he can really trust.