Twelve-year-old Jack, his younger sister, and the family's teenage foster child Troy go to Yellowstone National Park, where Jack's mother, a wildlife veterinarian, is investigating the report that wolves reintroduced to the park have killed a dog there.

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.

In this fast-paced adventure, the Landons trail a wounded wolf in Yellowstone National Park. The park is abuzz with rumors of a wolf attack. Meanwhile, a killer stalks the woods. Unaware of the danger, Jack and Ashley are more concerned about rebellious teenage foster child, Troy Haverson. From the opening moments at Old Faithful through 48 action-packed hours, the tension builds: What is lodged in the wolf's radio collar? And what is the meaning of the Native American story of Sin-a-Wavi? A heady mix of suspense, adventure, and moments of tenderness lure readers into this story of kids discovering the natural world. The book's afterword, by Yellowstone's Michael K. Phillips, explores the park's Wolf Restoration Program. National Geographic supports K-12 educators with ELA Common Core Resources. Visit www.natgeoed.org/commoncore for more information.

Jack, Ashley, and their parents visit Hawaii where they meet a Vietnamese boy who is going to live with his American grandfather whom he has never met, and are pursued by the Goddess Pele.

The Landons are in the Caribbean, in Virgin Islands National Park, to figure out what is destroying the coral reefs and causing the hawksbill sea turtle to disappear. Jack and Ashley find themselves hopelessly entangled in the mysterious life of Forrest Winthrop IV, the adopted son of a U.S. diplomat. Why is he so anxious to save an island woman named Cimmaron? What secret do they share? Follow the action to Jumbie Bay and see what the full moon reveals.

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.

The Landon family travels to Glacier National Park to investigate why grizzly bear cubs are disappearing and become involved with a ten-year-old Mexican runaway boy.

Jack's dad is the new caretaker for the Dareville Community Theater. Jack is not looking forward to living in the rundown theater. To make matters worse, a ghost visits him on the very first day. The ghost promises to haunt Jack until he helps solve the mystery of his disappearance. What will Jack discover is the answer to the ghost's disappearance? The ending is Up2U. Aligned to Common Core Standards and correlated to state standards. Calico is an imprint of Magic Wagon, a division of ABDO.

It's the end of the summer at Camp Dakota—and things are about to get hairy. The kids have adaptations on their minds. And after one camper notices Counselor Kyle's suspicious late-night activities, they begin to suspect that Kyle is turning into a werewolf. Is there another explanation? Or have the campers discovered a terrible secret? Look in the back of the book for experiments and more to help you become a science detective too!

The Landon family is Southbound—headed for Florida to investigate a mysterious illness plaguing endangered manatees in Everglades National Park. Jack, Ashley, and their friend Bridger soon find themselves in deadly waters with a seven-foot shark, an injured manatee—and a mystery to solve. Who was the stranger in the speedboat who snatched Jack's camera? And what does he have to do with the manatees? Join the heart-stopping chase through a maze of mangrove islands to find out!