Michael Gilbert 
Blood And Judgement [PDF ebook] 

When the wife of a recently escaped prisoner is found murdered and partially buried near a reservoir, Patrick Petrella, a Metropolitan Police Inspector, is called in. Suspicion falls on the escaped convict, but what could have been his motive? Petrella meets resistance from top detectives at the Yard who would prefer to keep the inspector out of the limelight, but he is determined to solve the mystery with or without their approval.