The End of Summer — Perry Crompton

Summary: Chisel fell back on his bottom, exhausted. He sat looking at the door. He had found #4 Dipagoo Highway! He had found Mootash!
Inside, would Chisel find the final clues to solve the mystery? Would he find the lost journal that explained what happened, and become hero of the valley? Or would he be kicked out of The Hidden Valley to The Valley of the Cave of the Tooth? Chisel's summer would come to an end, with a final flurry of activity and adventure.