On a summer evening in 2019, a group of young men set out to steal a quad bike from a rural property in Berkshire. When police officers respond to reports of the theft, a confrontation unfolds on a dark country lane, with devastating consequences for PC Andrew Harper…

A bitter separation, a custody dispute and growing concerns about the welfare of three children formed the backdrop to a devastating series of events in Edinburgh. As investigators pieced together what had happened, disturbing questions began to emerge…