The Key

From Author Wars - https://authorwars.com/books/the-key-725049.html

Overview:

Title: The Key
Author: Summers
Year: 1959
Type: Interior Art

Editions/Publications:

Unknown. Fantastic, July 1959 (Unknown, Summers, Ziff-Davis Publishing Company, $0.35, 132 pages, digest, MAGAZINE)
Unknown. Great Science Fiction, No. 7 (Unknown, Summers, Ultimate Publishing Co., Inc., $0.50, 132 pages, digest, MAGAZINE)