Captain Meriwether Lewis's dog Seaman describes his experiences as he accompanies his master on the Lewis and Clark Expedition to explore the uncharted western wilderness.

Fifteen-year-old Peak Marcello is invited to climb Hkakabo Razi, one of the most isolated mountains in the world, but getting there involves a four-week trek through a tropical rainforest that is rife with hazards, which turns out to be more dangerous than summiting the mountain itself.

What waits Beneath? Pat O'Toole has always idolized his older brother, Coop. He's even helped Coop with some of his crazier plans -- such as risking his life to help his big brother dig a tunnel underneath their neighborhood in the suburbs of Washington, DC. Coop is . . . different. He doesn't talk on the phone, doesn't use email, and doesn't have friends. He's never really cared for anything but the thrill of being underground and Pat. So it's no...

Pat O'Toole, his brother Coop, and their new companion, Kate, have narrowly escaped the cultlike community below New York City but must try to stop the cult's leader, Kate's grandfather.