"The Invisible Island" A to Z Mysteries children's book by Ron Roy 

"While picnicking on Squaw Island, a group of friends find a $500 bill. But when they return the next day, the whole island has disappeared and they must figure out the mystery to this vanishing act."

 

96 pages

Target Age: 5 to 8

Grades 2 to 4

Reading Level: 3.6

Lexile: 420