The book ‘By the Pricking of My Thumbs’ is written by Agatha Christie. ‘By the Pricking of My Thumbs’ is a detective fiction. It features Tuppence Beresford and Detective Tommy. The story basically begins when they visit Tommy’s Aunt Ada at Sunny Ridge Nursing Home. When Mrs. Tuppence confronts Lancaster she talks about ‘your poor child’ and ‘something behind the fireplace’.