“Dog is man’s best friend” and this documentary is the perfect illustration of this saying. In August 1915, two officers of the French Army are called for an incredible secret mission: bring back 450 sled dogs from Alaska and Canada within a hundred days. These dogs are essential to evacuate the injured soldiers and get fresh supplies. This historic race against time is illustrated through numerous archives, interviews of experts and reenactment. One question keeps the viewer’s attention: in spite of many obstacles, will the mission be a success?