Alvin Fernald's Incredible Buried Treasure

Alvin, Shoie, and Daphne embark on an exciting quest when they team up with a professor to decipher a mysterious coded message. Their mission is to locate a hidden copy of the Gettysburg Address, believed to be penned by Abraham Lincoln himself. This valuable historical document was secreted away by Caleb, a former slave who once resided in the White House.