The Skeleton Key Mystery (The Boxcar Children Mysteries)

The Aldens are visiting a small town known for its fall festival, and while Grandfather is off taking in the fall colors, the children try out the town's newest attraction--a Halloween escape room! The Aldens love solving the puzzles to get out of the room, and they don't mind the spooky theme. The problem is, someone--or something--is making things downright scary for other customers!