The White Room

From Author Wars - https://authorwars.com/publications/the-white-room-553172.html

Overview:

Title: The White Room
Author: Elizabeth Coatsworth
Year: 1958
Publisher: Pantheon Books
Price: $2.75
Pages: 144
Binding: Hardcover
Type: Novel
Title Reference: The White Room
Notes:
Maine State Library uses subtitle "An Incredible Tale". Encyclopedia of Fantasy does not, for this alone in the four-volume "Incredible Tale sequence". Price on front flap of Archive.org copy. Last page is unnumbered.