Seventh(?) in the Wayward Children series, this one is less about any one particular child’s journey than about the doorway universe as a whole, which weakens the (usually stellar) character work even as it lays the groundwork for further stories. The insertion of a couple of the characters into the “evil” school counterpart is a bit contrived, but you could tell McGuire wanted to explore the concept of the other school and what made it tick; I’m sure we’ll come back and explore it in following books.