Mislaid in parts half-known

Antsy and her friends at Eleanor West's School for Wayward Children learn that the place she came from, the Shop Where the Lost Things Go, could be a central hub for accessing other worlds and may be the key to helping students find lost doors. Though Antsy is cautious about returning to the Shop, she, Sumi, Cora, Kade, and Christopher are forced to make a quick decision to return after a school bully begins demanding she help her find a lost door. Upon returning, Antsy learns Vineta and Hudson haven't kept their promise, and she sets about turning things to right and helping her friends make choices about returning to their old worlds.