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
Pee-yew! What?s that pong? It?s a letter from Thea ? she?s in danger! Geronimo?s sister has disappeared during a treasure hunt on Easter Island. Armed with a map and some cryptic clues, Geronimo and his friends rush to the rescue. Will they find Thea before she and the treasure are lost furever?