The Hardy boys, vacationing in Vermont, offer to help the police locate a missing camper and find themselves involved with a doomsday cult, a deadly strain of bacteria, and possibly the devil.
- ISBN10 0671497235
- ISBN13 9780671497231
- Publish Date 1 January 1984
- Publish Status Active
- Publish Country US
- Imprint Wanderer Books
- Format Paperback (US Trade)
- Pages 200
- Language English