Frank and Joe are in Hawaii at a dolphin research center, where they discover that one of the dolphins has suffered a suspicious injury and one of the researchers has vanished.
- ISBN10 0606070001
- ISBN13 9780606070003
- Publish Date 31 December 1994 (first published 1 December 1994)
- Publish Status Unknown
- Out of Print 25 March 2015
- Publish Country US
- Imprint Demco Media Inc
- Edition Turtleback School & Library ed.
- Format Hardcover
- Pages 149
- Language English