A Lover Too Many

Peter Marlin's wife is found strangled and he becomes the prime suspect.
She'd only just returned from an unexplained absence of several months. And during that time, Peter had found a new lover. Everything points to the husband but there's no real proof.
Inspector John Crow is called in to help the local police. But his new colleagues aren't keen on an outsider. And Crow must solve the case before anyone else dies.
Inspector John Crow
Skeletally-built, mild-mannered Inspector John Crow is established in the Murder Squad in London and constantly meets hostility when he is called upon to work on murder cases in regional crime squads in Wales and the Midlands. He displays strong moral feelings, and a sensitivity which brings him into conflict with regional staff as he doggedly and successfully pursues the truth in cases where he is called in.