One day in winter a military drone on a training flight hurtles out of the sky and smashes into a holiday park. A young mother living in a static caravan is killed instantly.

While all the initial reports suggest a tragic accident, Abby Hughes suspects the crash was a deliberate act of sabotage by a homeless man who made maps and hated war. Determined to find the truth, she has to contend with the powerful forces trying to bury it.