The Dog Walker

January, 1987: in the depths of winter, only joggers and dog walkers brave the Thames towpath after dark. Helen Honeysett, a young newlywed, sets off for an evening run from her riverside cottage. Only her dog returns. Twenty-nine years later, her husband has asked Stella Darnell, a private detective, and her sidekick Jack Harmon, to find out what happened all those years ago. But when the five households on that desolate stretch of towpath refuse to give up their secrets, Stella and Jack find themselves hunting a killer whose trail has long gone cold.