A Killing Coast by Pauline Rowson

Detective Inspector Horton returns and is feeling the heat . . . - When a body is found floating in the sea off Portsmouth harbour, Detective Inspector Horton judges it to be an accidental death, but soon discovers he's got it very wrong. Under pressure from his superiors, Horton wonders if his ongoing investigation into the disappearance of his mother over thirty years ago has clouded his judgement. Against all the odds, he must now not only find a brutal killer, but also prove to himself, and others, that he is still up to the job.