The Grey Envelope
From Author Wars - https://authorwars.com/books/the-grey-envelope-3312325.html
Overview:
- Title: The Grey Envelope
- Author: Edgar Wallace
- Year: 1918
- Type: Short Fiction
- Series: My Adventures as a German Spy in Britain
Editions/Publications:
- Unknown. The Adventures of Heine (Unknown, Edgar Wallace, Ward Lock & Co., Hardcover, Collection)