Superbowl Upset

This novel's title is right on the mark, for Twohill ( Bigmouth ; Jeeter, Mason and the Magic Headset ) fills her diverting plot with upsets aplenty--some of which will make middle-grade readers roar with laughter. In the minds of 10-year-olds Ginger and Lucas, the first upset was the marriage of her dad and his mom. Arch-rivals for years, the stepsiblings glower and hiss their way through family dinners. But when Lucas's mother wins four tickets to the Superbowl in New Orleans, it looks as though the two kids (both devoted fans, even if they root for opposing teams) will finally bury the hatchet and enjoy a thrilling weekend. And thrilling it is--but not for the expected reasons. A feisty pet, an obnoxious, clinging family, irritating relatives who arrive unannounced and lost football tickets all add to the calamity--and hilarity. Twohill scores with this one. Ages 8-11. ( Mar .)