Lillian Cartwright walked out of the door one day and never came back... The Woman Who Vanished. Whilst enjoying a restful break in Suffolk, Kathleen and Gerry Croft find their peace is shattered when a group of noisy, middle-aged volunteers arrive at the hotel. The group are helping to restore a nearby country estate, which has been uninhabited for the best part of 40 years. The more Kath and Gerry hear about the strange history of Sandlings Hall, the more intrigued they become. Kath finds herself inexorably drawn into the complicated past of this beguiling place. In the process, she uncovers the disappearance of a woman on the estate nearly 60 years before. Can Kath discover the fate of Lillian Cartwright and solve the mystery of Sandlings Hall - or will malign forces in the present day prevent her from uncovering the truth? With the help of her son and daughter-in-law, Kath is determined to find the answers. But Imogen and Hugh have problems of their own to deal with, as the death of a young girl drags them into a new and terrifying investigation, where they are forced to confront their most dangerous adversary yet.