At Storm Cliff Stables, Ainsley and her cabin-mates, the Four Horsekateers, are engaged in a pranking battle with another cabin group called the Core Four, but they soon find that this kind of activity can get out of hand--especially when somebody outside the group starts pranking everybody.

School's almost out for the summer, and A.J. is dreaming about all the fun things he's going to do on vacation. But A.J.'s dream quickly turns into a nightmare when three familiar spirits appear to show him summers past, present, and yet to come. Will they be able to convince him to leave his bad ways behind? Or will this summer end up being a total bummer? Best selling author Dan Gutman brings his kid-friendly sense of humor to this special series...