The Saddle Club girls – Lisa Atwood, Stevie Lake and Carole Hanson – are at one of their favorite places – Moose Hill Summer Camp. This time they're staying for an entire month. It will be the best summer ever! Or will it? For Lisa is put in a different cabin from her friends, Stevie's boyfriend is practically ignoring her and, worst of all, horse-crazy Carole has been given a horse to ride that simply won't cooperate!
Then the girls start running into ominous signs that someone wants to close down Moose Hill Camp forever. Can they find out who, before it's too late?