Spring break has finally arrived in Buckman, and the only assignment Wally Hatford and Caroline Malloy have is to do something they have never done before. For Wally, that sounds like a piece of cake, especially when he finds out the mighty Benson brothers are coming to stay for vacation. With nine boys teaming up, they are ready to plan the ultimate prank to scare the three Malloy sisters silly by convincing them their house is haunted. But the boys have no idea what they are up against. The Malloy girls are already hard at work plotting their own brilliant surprise welcome. As the legendary practical joke war between the Hatfords and the Malloys escalates, the neighborhood is thrown into hilarious chaos. Meanwhile, a very real danger is lurking just outside of town. Everyone is talking about a hungry cougar on the prowl. When the kids decide to call a temporary truce and join forces to catch the wild animal, someone has to take on the scariest job of all. Jump into this laugh-out-loud adventure where rivalries turn into teamwork, and everyday kids face off against ghosts, girls, and a giant cat.