The three young sleuths solve a case of double identity while investigating the legend of Monster Mountain.
- ISBN10 0394842596
- ISBN13 9780394842592
- Publish Date 12 September 1979
- Publish Status Active
- Publish Country US
- Imprint Random House Books for Young Readers
- Edition Random House Pbk ed.
- Format Paperback (US Trade)
- Pages 142
- Language English