"He saw a bare arm first, the hand palm up with fingers curled inwards. Then he stopped and took a few breaths. He could hear the two constables making arrangements before they separated, one saying he'd bring the other some tape from the car, and then it was just the summer morning quiet again." Detective Sergeant Chris Waters got the call at 05.29 that July morning. This is it, said DCI Reeve, you'll be first there, it's all yours, you're the crime...