"Raina wakes up one night with a terrible upset stomach. Her mom has one, too, so it's probably just a bug. Raina eventually returns to school, where she's dealing with the usual highs and lows: friends, not-friends, and classmates who think the school year is just one long gross-out session. It soon becomes clear that Raina's tummy trouble isn't going away--and it coincides with her worries about food, school, and changing friendships. What's going...

"Follow Bea, Archie, Trudy, and Spencer (otherwise known as the BATS!) as they crisscross the globe using every type of bridge: beam, arch, truss, and suspension. From ancient low-slung rope bridges to modern hi-tech towers of steel, they'll traverse 'em all. Their journey will take them through history and connect them with new ideas and different cultures. Along the way they'll identify the dangerous forces trying to bring bridges crashing down,...