A winning trifecta for tween girl readers: horses, mysteries, and an early chapter book series that celebrates the bond between best friends! Meet Hannah, Sofia, Lisa, and Sarah--the best friends who share a love of horses. They've even created their own special club that's all about riding! But now things are going to get even more exciting as the girls stumble into a series of mysteries. Can they solve them . . . and still keep winning tournaments, too? This fun series has everything that tween readers want.