"Thirteen-year-old Lucy Eberslee, the Gatekeeper's deputy at the end of the world, teams up with Arthur and Rosemary, who are from other worlds, to investigate why the doors between worlds are stuck"--OCLC.
year:
call number/section: 1000
subjects: missing persons, juvenile fiction, doorways, space flight, magic, space and time, adventure stories, fiction, adventure and adventurers, fantasy, doors, adventure fiction, action and adventure fiction, fantasy fiction