Tim slipped the message in a pocket. It had been a great adventure, more thrilling by far than he had ever dared to dream, but he would be glad when the _S-18_ nosed its way back into New York harbor. THE END ------------------------------------------------------------------------ This is the fourth book in the Tim Murphy Series. Have you read all of them? Volume I Daring Wings Volume II Sky Trail Volume III Circle-Four Patrol Volume IV The Treasure Hunt of the _S-18_ End of Project Gutenberg's The Treasure Hunt of the S-18, by Graham M. Dean