Trixie Belden #9 - The Happy Valley Mystery - 1962
During this adventure, Trixie and the Bob-Whites are headed for Iowa to the Belden's Uncle Andrew's farm - Happy Valley Farm.
When they arrive, they discover Uncle Andrew's sheep have been disappearing. Being the detective that she is, Trixie is determined to find out what's going on. Her main suspect is a man with a black beard. In addition to this book's mystery, there is a flood which also endangers Uncle Andrew's sheep. These sheep end up being major trouble for the Bob-Whites.
In another storyline, Trixie impresses a boy, Ned Schulz, with her basketball skills. The gang also meets twins Barbara and Bob Hubbell and Trixie becomes jealous of a pretty girl's interest in Jim. That green-eyed monster is finally rearing its ugly head ...