Frank and Joe investigate the legend of Whalebone Island when they receive a warning concerning a sunken freighter
- Genre: Juvenile Fiction
- Subgenre: Mysteries + Detective Stories, Boys + Men
- Age: 9-12 years
- Publisher: Grosset & Dunlap
- Pages: 176
- Language: English
- Format: hardcover
- Release Date: June 1, 1938
- Date Published: June 1, 1938
- Author: Franklin W. Dixon