"It's Halloween in Elliot's Park and the squirrels are all in costume, ready for some trick-or-treating fun. But when Elliot, Chip, Twitch, and the rest of the gang think they see a ghost in Camp Canyon, there's a frightful mystery to be solved. Can Elliot and his friends figure out who is haunting the park before something scary happens and still have time to trick-or-treat?"--Publisher.

Ryan and Sarah use the Raven puzzle to hunt for a new hidden treasure, but Ryan becomes increasingly fearful for their lives when Sarah takes too many risks during the cross-country trip and he realizes that the Raven might be after him.