When a light aircraft crash-lands at Machrie airport, Daley and Scott rush to the scene. But it soon becomes clear that both occupants of the plane were dead before take-off . . .
Meanwhile, tending to his lobster creels, Hamish finds himself in the wrong place at the wrong time, and back at the County Hotel, Annie is beginning to suspect her new boss Ian Macmillan may not be as he first appeared. And a face from the past has returned to haunt Carrie Symington, but is it a case of better the devil you know?
Daley and Scott find themselves battling retired terrorists and climate-change activists as the action spills across the North Channel to County Antrim - all under the scrutiny of the Security Services. Faced with so many questions, how will Daley uncover good from bad, right from wrong? The search is on for any other truth.