The Poole Harbour Murders: 10

DCI Lesley Clarke is back! The dust has settled after the arrest of DCI Mackie's killer and Lesley has been told to make a few changes. She's got two DIs to manage, including one she's clashed with in the past, and is overseeing the return of a colleague who left Dorset under a cloud. Just as she's starting to get to grips with it all, a body is found in Poole Harbour. Is it Jackie Kendal, who went missing a year ago, or Rowena Sharp, who mysteriously vanished after leaving her baby alone in a Sandbanks hotel in 1973? Establishing the body's identity, and therefore whose case this will be, will require Lesley's investigatory skills and, more challenging, all of her tact and diplomacy.