Gertrude Chandler Warner
Henry, Jessie, Violet, and Benny once lived on their own in a boxcar... The Boxcar Children are spending the summer in a tiny, quiet New England fishing village. The little schoolhouse doesn't have a proper teacher, so the Aldens are teaching! There's also a very old library where nobody ever goes — nobody, that is, except for a mysterious stranger. For such a small town, Port Elizabeth has a lot of secrets! Look for more Boxcar Children
...Aunt Jane takes the Aldens to stay with her friend, Kay, who owns an old, shabby motel in Florida. Kay is ready to sell the motel, when the children offer to help fix it up and put it back in business. But they soon learn that someone is trying to make sure it stays out of business . . . forever.
The Aldens are helping save an old library that's about to be torn down. If they fix it up, it might be given landmark status! But after all their hard work, it's very clear someone is trying to destroy the library. But who?