Two owl detectives solve a Halloween mystery in this installment of a charming early reader series, perfect for fans of the Owl Diaries.

Wallace and Grace, best friends and partners in the Night Owl Detective Agency, work together to solve mysteries!

When Lukas the fox, Ava the opossum, and Mateo the squirrel all show up to the Owl-o-ween party with the same costume, no one know whooo had the idea first—or whooo should win the delicious boo-berry pie prize. Can Wallace and Grace uncover clues to solve this costume catastrophe? For Ages 5 and up.