During the first meeting of the Winter Warmth Book Chat, the lights in Mary's Mystery Bookshop go out. When they come back on, Mary realizes a book has been stolen from the counter. And not just any book. This was a signed early edition of The Murder of Roger Ackroyd by Agatha Christie. Mary intended to sell the rare and valuable copy and donate the money to help a little girl get a kidney transplant. Now everyone at the Book Chat is a suspect, and Mary must solve one of her most important mysteries yet -- in time to help Isabella.