Katie, Lily, and Jasper attach their flying Gyroscopic Sky Suite to the Moose Tongue Lodge and Resort, where they mingle with other child heroes found in books, and where they become embroiled in a mystery involving lederhosen-clothed quintuplets and a screaming ventriloquist.
During the summer of 1987, Allie Jo, whose family runs an antebellum Florida hotel, meets Chase, who is staying there with his father, and they become friends when they discover a mysterious teenager hiding on the grounds of the hotel.
When the Hardy brothers go to Maine to help one of their father's friend solve a mystery of strange accidents at his hunting lodge, they find there is a fortune in stolen money buried somewhere and the lodge is full of likely suspects.
When Frannie and her mother accompany her father on a business trip to Florida, Frannie would rather help him at the conference hotel than go with her mother to Princessland theme park.
A girl suffering from amnesia finds herself in a run down motel filled with strange creatures who seem to know her and may be able to offer clues to her past.
Leo, the son of the maintenance man of the Whippet Hotel, opens a series of cryptic boxes which reveals hidden floors, strange puzzles, and unexpected alliances and lead him on an adventure to save the building and his future.
Travis and his sister Corey decide to boost business at their grandmother's Vermont inn by staging a few "hauntings" that soon draw tourists from across the country, but when their antics awaken a dark force, they must find a way to put to rest the ghosts they have disturbed.
