Search - A Crossworder's Delight (Crossword Mystery, Bk 11)

From Amazon:

While helping decorate a local inn for Christmas, Belle finds a handmade book of dessert recipes written in the form of crosswords, dedicated from mother to daughter. While she tries to puzzle out how such a treasure could have been abandoned, a precious poem belonging to the inn goes missing and the owners call Rosco to help. At first, Belle and Rosco think the case is a piece of cake, and gently roll their eyes at the fantastic scenarios that an eager young boy is cooking up to explain the theft. But his wild story might just measure up to the truth.