Murder is afoot in the Southwest, again. Muriel Jennings, elderly mother and owner of the successful Jennings Clay Company, has met a premature end—survived only by her children and business partners, Stella and Mark. James, Katie and Fiona Sinclair, at Moorland Forensic Consultants, have been tasked with assisting the investigation. After attending a meeting at Muriel's book club in Bovey, Katie learns the last book to be read: The Sinner's Daughter by Lillian Webster—the story of Ted Cartwright who murdered five women in his remote home on Dartmoor, a little over fifteen years ago.