Recounts the adventures of the Alden children as they solve the mystery of the old schoolhouse in Port Elizabeth.
- ISBN10 1453207945
- ISBN13 9781453207949
- Publish Date 21 August 2014 (first published 1 January 1948)
- Publish Status Active
- Imprint Albert Whitman & Company
- Edition 978th Awc Eisbn 978-0-8075-9657-9 ed.
- Format eBook
- Pages 128
- Language English