While camping in Zion National Park, Jake Evans and his friends uncover a new set of cryptic clues hidden in his grandfather's scrapbook. Battling unpredictable weather, unforeseen challenges, and an elusive adversary, the three friends are forced to rely on their problem-solving skills, the power of their growing friendship, and the courage to do the right thing.--Publisher's description.

"Before leaving on a two-month summer vacation, Jake Evans finds a gift from his deceased grandfather that will lead him on a scavenger hunt through ten of America's most rugged, wild, and beautiful national parks."--Page 4 of cover. After camping in Rocky Mountain National Park, Jake and his friends travel to the Great Sand Dunes in southern Colorado. Exploring the heart of the dunes, they stumble upon something both unexpected and dangerous. Through...

In the riveting second installment of the National Park Mystery Series, archaeologist Chuck Bender finds himself and his young wife and stepdaughters in the crosshairs of an unknown killer when he defends his brother-in-law from false accusations of murder in the brutal slaying of a resort worker in Rocky Mountain National Park.

"When his new stepdaughter is kidnapped during a visit to the Grand Canyon, archaeologist Chuck Bender faces up to his secret past and his unfamiliar family-man role as he confronts every parent's worst nightmare--that of a missing child"--Page 4 of cover.

While visiting the Everglades National Park with their parents, the Landon children uncover the mystery of dying manatees and learn important lessons about the natural environment.

While their mother investigates a series of bear attacks in and near Gatlinburg, Tennessee, Jack and Ashley learn about country music and Cherokee people from two new friends, one of whom is keeping a secret.

"Snowmobiles are impacting the wolverine population at Denali National Park. And the Landons are there to help figure out why. Panic grips the Landon kids and 13-year-old Nicky Milano as they realize thay have been abandoned in the wilds of Alaska's Denali National Park. As they huddle together agianst the cold, they hear a deafening roar. Avalanche! If someone doesn't find them soon, they will freeze to death. Can they figure out a way to escape...

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.

While she studies condors in the Grand Canyon a scientist's life is threatened, and the strange, hostile, teenage computer whiz in her family's foster care might be involved.

Jack, Ashley, and their unreliable new foster sister set out to solve the mystery of why whales are beaching themselves at Acadia National Park. While investigating mysterious strandings of whales in Maine's coastal Acadia National Park, the Landons are joined by 14-year-old Bindy Callister, a temporary ward. When Jack, Ashley, and Bindy find a baby humpback whale stranded in a tidal pool, Bindy suspects who's responsible, but she's too scared to...