The invisible island /
by Ron Roy ; illustrated by John Steven Gurney.
- New York : Random House, 1999.
- 86 p. : ill, map ; 20 cm.
- A to Z mysteries. .
"I"--Spine. "A Stepping Stone book."
While picnicking on Squaw Island, Dink, Josh, and Ruth Rose find a hundred dollar bill, and when they return to explore further they find an entire cave full of money.