Death on Lindisfarne

Twice each day the holy island of Lindisfarne is cut off from the mainland by the incoming tide. Slight and ginger-bearded, Aidan the photographer and accidental sleuth brings his inquisitive eight-year-old daughter Melangell to the retreat centre on Lindisfarne. There they meet Lucy, a young Methodist minister with a painful past, who is running a course on Northumbrian saints. When one of the course members is found dead on the beach, suspicion falls on one guest, then another. Or could the tides have allowed a murderer to come from the mainland? Then someone from Lucy's previous life makes a most unwelcome appearance...