“Trixie Belden and the Happy Valley Mystery” was written by Kathryn Kenny and illustrated by Haris Petie. This edition was published in 1966 by Golden Press. It was the ninth book in the series and takes place at Happy Valley Farm in Iowa. Trixie is eager to solve the mystery of their missing sheep, but that is set aside as Trixie, her best friend, Honey Wheeler and Honey’s adopted brother, Jim find themselves trapped in a flood.