The ball he caught himself. The ball he got signed by the player who had hit it. The ball he took proudly to school to show his classmates. That ball goes missing, and Zach needs the help of his sister Zoe to find the prized moment and the culprit.
Perfect for fans of Cam Jansen, #1 New York Times bestseller Mike Lupica begins an exciting new chapter-book series, featuring his trademark sports action and heart, and a lovable twin brother-sister duo who solve sports-related mysteries.

There's nothing eight-year-old twins Zach and Zoe Walker love more than playing sports and solving mysteries. And when those two worlds collide . . . well, it doesn't get any better than that. So when a baseball signed by Zach's favorite major league player suddenly goes missing--the search is on! Luckily, amateur sleuths Zach and Zoe are on the case. Can they solve the mystery and find the ball before it's lost for good?

In this first book of the Zach and Zoe Mysteries, bestselling author Mike Lupica begins a series for a new and younger audience, introducing readers to a sports-loving detective duo who can swing for the fences and catch the culprit in one fell swoop. With a recipe equal parts sports and mystery, the Zach and Zoe Mysteries break fresh ground for an author who has been called the greatest sportswriter for kids.