Olive doesn't believe in ghosts, but something weird is definitely going on at the orchard and she wants to get to the bottom of it in this third novel of a sweet series about the bonds of friendship. Olive, Peter, Sarah, and Lizzie are getting ready for Halloween. This year, they're planning a zombie hayride and a haunted barn party. As they set up, Lizzie's older sister, Gloria tells them that a ghost haunts the very barn they're decorating. According to Gloria, the ghost is angry and desperate for revenge. Lizzie, Sarah, and Peter are fascinated, but Olive doesn't believe any of it. Not even when strange, ghostly things keep happening all around them. Olive sets out to prove that ghosts don't exist and that Gloria and her friends are behind it all. But the more Olive investigates, the scarier things become. Could Gloria be telling the truth? Is the orchard really haunted?