Island life suits Susan, and she can't imagine ever moving from her beloved Isle of Wight. So it gives her real pleasure to see her young lodger Colette settle in to life by the sea, especially knowing that she has such a troubled past.Susan's days are comfortingly routine, starting every morning by exercising her beloved Rocco on Ventnor beach with her fellow dog walkers. The group may have bonded over their fondness for their canine companions, but over time their friendships have deepened. So, when Colette dies in suspicious circumstances at Castle Cove, Susan is devastated to realise that the dog walking group were the last to see Colette alive, and one of her friends must have been responsible for her death. And when Susan begins to suspect that the police are minded to put Colette's death down to an accident, Susan decides she won't rest until she solves the mystery and finds the murderer.