Two children receive messages in an old mailbox in a vacant lot and are plunged into the strangest week of their lives.
- ISBN10 0671560867
- ISBN13 9780671560867
- Publish Date 1 October 1980 (first published 1 January 1979)
- Publish Status Out of Print
- Out of Print 30 May 2021
- Publisher Simon & Schuster
- Imprint Pocket Books
- Format Paperback (US Trade)
- Language English