When a valuable stamp is stolen from a museum, the four Bobbsey twins try to help find the thieves.
- ISBN10 0671435876
- ISBN13 9780671435875
- Publish Date 1 April 1983 (first published 1 January 1983)
- Publish Status Active
- Publish Country US
- Imprint Minstrel
- Format Paperback (US Trade)
- Language English