Bella Baxter's idea to add special touches to the rooms of their guests at the Sea Inn backfires when an important botanist, Dr. Frederick Fauna, arrives.
While visiting Aunt Molly at a fancy downtown hotel, Cam uses her photographic memory to help one of the guests find her stolen luggage and pet cat, and to catch the thief.
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.
While staying at an eighteenth-century inn in Vermont, the Boxcar children become curious about the mysterious "accidents" that keep plaguing the owners.