When Carol Walker was murdered just days before her 48th birthday, detectives were faced with an unusually brutal crime and apparently no clear motive. Their investigation soon led them to a young man with a history of obsessive behaviour. But understanding what had happened would prove far more complicated.…

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…