The Yukon Quest International Sled Dog Race is one of the most challenging sporting events in the world. Every February, a handful of hardy souls spends over two weeks racing sleds pulled by fourteen dogs over 1,023 miles of frozen rivers, icy mountain passes, and spruce forests as big as entire states, facing temperatures that drop to forty degrees below zero on nights that are seventeen hours long.

Why would anyone want to enter this race? John Balzar-who moved to Alaska and lived on the trail-treats us to a vivid account of the grueling race itself, offering an insightful look at...