Deborah Hopkinson 
Long Trail [EPUB ebook] 

Klondike or bust! Stowing away on the steamer Al-Ki was only the beginning of Davey’s daring quest to find his uncle in the Klondike. Now he’s camping in the rough-and-tumble town of Skagway, working for his photographer friend Erik Larsen, and preparing for his next challenge — the steep, treacherous, hundreds-of-miles-long Chilkoot Trail. When Erik falls ill on the trail, Davey fears he will not be able to go on — until he gets help from a surprising ally.