The Bag of Bones Mystery — George W.J. Laidlaw

Meghan and Georgina live for riding and when the local doctor invites them to ride two of his prized horses their happiness has no limit. Both 10-year old girls are fierce competitors and their archrival Cassie challenges them in the district-jumping contest. But this is only the beginning of a challenge to both Georgina and to Meghan. Lives are at risk as Meghan finds, escaping her kidnappers in a ride that is worse than anything she has ever experienced and is more challenging than a jumping contest. Riding in darkness in a fierce thunderstorm is almost beyond her ability, but if she doesn't find help people will be lost.