Who was that man in the Park Service uniform who brought Jack and Ashley Landon into the wilds of Alaska’s Denali National Park along with their friend Nicky Milano? Whoever he was, he has given them a dogsled ride to certain death unless somebody finds them soon. Their troubles are about to get a whole heap deeper as the first rumblings of an avalanche turn into a deafening roar!

Gloria Skurzynski is an award-winning author who has written more than 50 children's books. Her nonfiction book Almost the Real Thing won the American Institute of Physics' Science Writing Award. She has also penned numerous works for National Geographic, including Are We Alone?, an IRA/CBC Young Adults' Choice for 2006. Skurzynski lives in Boise, Idaho.
Alane Ferguson's skill at weaving mystery and suspense into middle-grade fiction won her an Edgar Award for Show Me the Evidence. Along with Gloria Skurzynski, she has cowritten many books in National Geographic’s Mysteries in Our National Parks series. Once they decide on a plot they do on-site research in the featured park, then collaborate by phone, fax, and e-mail to develop the page-turning plot. Ferguson lives in Elizabeth, Colorado.