幻惑密室

From Author Wars - https://authorwars.com/publications/huan-huo-mi-shi-555302.html

Overview:

Title: 幻惑密室
Author: 西澤保彦
Year: 1988
ISBN-10: 4061820036
Publisher: 講談社
Pages: 331
Binding: Paperback
Type: Novel
Title Reference: 幻惑密室
Notes: Data from Amazon.co.jp
Title transliterates as "Genwaku Misshitsu" (The Enchanted Secret Room)
Cover has "Internal Illusion" in English above the Japanese title, it is unclear if this is part of the title, none of the other sources seem to indicate this is part of the title