Joe Stoshack lives for baseball. He knows everything there is to know about the game -- except how to play well. His specialty is striking out. Stosh feels like a real loser, and when he takes a low-paying job cleaning a bunch of junk out of his neighbor's attic, he feels even worse -- until he comes across a little piece of cardboard that takes his breath away. His heart is racing. His brain is racing. He can hardly believe his eyes. Stosh has stumbled upon a T-206 Honus Wagner -- the most valuable baseball card in the world! And he's about to find out that it's worth a lot more than money....

Dan Gutman is the New York Times bestselling author of the Genius Files series; the Baseball Card Adventure series, which has sold more than 1.5 million copies around the world; and the My Weird School series, which has sold more than 30 million copies. Thanks to his many fans who voted in their classrooms, Dan has received nineteen state book awards and ninety-two state book award nominations. He lives in New York City with his wife. You can visit him online at dangutman.com.