Cop To Corpse (Peter Diamond, #12)

On a Sunday morning in Bath, a policeman on beat duty is shot dead - the 3rd killing of an officer in a matter of weeks.
The assassinations are the work of a sniper who seems to be everywhere and nowhere at once, always a step ahead. The younger detectives try their best with what little evidence he leaves, but they're no match for this murderer and his merciless agenda.

When Chief Superintendent Peter Diamond joins the case, he begins to find curious connections between the dead officers after talking to their widows. But a dangerous forest encounter with the killer leaves Diamond in the lurch and the sniper in the wind. Things get even more complicated when the evidence starts to suggest that the killer might be one of Britain's finest--a theory unpopular among Diamond's colleagues. Can Diamond manage to capture an elusive and increasingly dangerous killer while keeping his team from losing faith in him?