Sixth grade is supposed to be the year that Jack Callahan would lead his team to a record-shattering season and the Little League World Series, but after the death of his brother he loses interest in baseball and only Cassie, star of the girls' softball team, seems to understand.

Eighth-grade star quarterback Nate Brodie's family is feeling the stress of the troubled economy, and Nate is frantic because his best friend Abby is going blind, so when he gets a chance to win a million dollars if he can complete a pass during the halftime of a New England Patriot's game, he is nearly overwhelmed by the pressure to succeed.

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. The football fiasco: In this third mystery, Zach and Zoe discover their football has been completely deflated, leaving them without a ball to play with at recess. But who's behind it. The soccer secret: Soccer season is underway, and though Zach and Zoe play...