Christina and Grant start in New Orleans. Their two new friends start at the headwaters of the Mississippi River in Minnesota. They planned to meet at the Gateway Arch in Saint Louis. But they didn't plan on getting involved in a very strange mystery which takes them over locks and dams, past Tom Sawyer's cave and past many other fascinating sights along the mighty Mississippi. Are they being followed? Tricked or trapped? Come along for the ride and see!Renaissance Learning, Inc now has Accelerated Reader quizzes for all of the Carole Marsh Mysteries! To visit their website, click here.Want a sneak preview of this great mystery? Click HERE to download the first three chapters (approximately 507 KB)!Marsh, Carole is the author of 'Mystery on the Mighty Mississippi', published 2004 under ISBN 9780635023919 and ISBN 0635023911.