While vacationing on a California ranch, three boys decide to investigate strange wails that come from a mysterious cave where a famous outlaw disappeared.
- ISBN10 0394837738
- ISBN13 9780394837734
- Publish Date 12 May 1978
- Publish Status Active
- Publish Country US
- Imprint Random House Books for Young Readers
- Format Paperback (US Trade)
- Pages 176
- Language English