While their parents study why wolverines are disappearing from Alaska's Denali National Park, Jack and Ashley are stranded in a remote area with their mysterious new foster brother when a hit man's bullet triggers an avalanche.

Hank the Cowdog, Head of Ranch Security, tries to find out who is stealing feed out of the feed shed. When Slim sets a live animal trap, Hank decides to check it out, only to find himself trapped.

My friend George is competing in a grueling three-day mountain-bike race in Costa Rica, and her cousin Bess and I will be there as her support team. But when I find out someone's taking dangerous steps to make sure top U.S. cyclist Derek Woodhall doesn't will, I realize George may not be the only rider I need to help. Could last year's winner be the culprit? He was freaking out when Derek took an early lead. Or maybe Derek's publicist? She seems a...

When her family moves to Philadelphia's Society Hill neighborhood in 1866, Addy discovers that her new home holds dangerous secrets--including one connected to the North Carolina plantation she had escaped from only two years earlier. Includes a brief overview of the experiences of African Americans during Reconstruction, the period immediately following the Civil War.

Uncle Samuel S. Stingysnout invites the whole Stilton family to creepy, faraway Penny Pincher Castle for a big surprise.

Twelve-year-old Nellie Tibbits and her herpetologist mother have been in Bog Hollow for a month, but most of the other children regard Nellie as a weird Northerner; however her pet corn snake wins the friendship of Daryl Tate, who is as obsessed with snakes as his grandmother is with stray cats, and when one of the cats disappears Nellie joins the Bog Hollow boys in the search--and hatches a plan to help get Granny Tate's strays adopted.

Boy Technonaut, Jasper Dash, and his friends Lily Gefelty and Katie Mulligan travel into the mist-shrouded heart of the forbidden mountainous realm of Delaware to try and unravel a terrible mystery.

Visiting Zion National Park with his family, twelve-year-old Jack encounters two mysteries, the strange behavior of a band of wild mustangs and the possibly sinister actions of his new foster brother, a Shoshone boy.

When Kirsten's new friend Erik disappears, she has to figure out whether he ran away to get out of some promises he made, or whether something else has happened.

While staying with her Aunt Millie in the Appalachian Mountains of Kentucky in the summer of 1934, Kit tries to discover who is sabotaging a visiting folklore researcher.