The Bone Field by Kernick Simon

1990: a young woman goes missing while backpacking in Thailand. She is never seen again. 2016: her bones are discovered 6000 miles away in an English field and, within hours, the boyfriend who reported her disappearance all those years ago is dead. So begins a hunt to solve her murder that will take DI Ray Mason and PI Tina Boyd into a dark and terrifying world of corruption and deadly secrets, where murder is commonplace, and nothing and nobody is safe.