Boston, present day. As a major museum prepares to unveil an exhibition of artifacts from ancient Tartessos, a senior curator vanishes—leaving behind a hand-drawn map of a gallery that doesn’t exist. Join a team of investigators from the Magnus Institute as shifting corridors draw them beyond the museum’s familiar walls and into a labyrinth where every path leads deeper into the City In-Between. To find the missing curator and return home, they must uncover what waits in Gallery 244—before they become part of the collection.