Ever since her vision started deteriorating, fourteen-year-old McKenna Barney has felt out of place in the world. Now, to help her younger sister with her own ongoing battle with an eye disease, McKenna finds herself at the head of her team of eight sled dogs in a race she's not sure she can even see, let alone win. For three days of shifting lake ice, sudden owl attacks, bitterly cold nights, and frequent snow squalls, McKenna faces both the Canadian wilderness and her terrifying vision loss. But she hides the truth from everyone, including her toughest rival, Guy, despite their budding alliance.