When her zany neighbour Doris Cleaver invites Ruth Finlay on a hiking tour with a mixed group of trauma survivors, neither anticipates that they'll have to solve a murder.When one of the party, a nurse from Melbourne, is found dead in her room before they've even started the hike in Apollo Bay, they know there is a killer in their midst. Then, on that same day, one of the tour group disappears.As Ruth battles a bout of influenza that leaves her weak and scarcely able to think, Doris gets up to her usual cantankerous antics. But are they being followed and why does the group seem to have a death wish, putting themselves in mortal danger on a daily basis?An unputdownable mystery set in a wilderness of steep cliffs and tidal beaches, MURDER ON THE GREAT OCEAN WALK is the fourth book in Isobel Blackthorn's Ruth Finlay Mysteries series.