Sixteen-year-old Kat and her mom haven't seen much of each other since Kat's father died last year. Her mom has taken over the family trucking business and has been away a lot. She promised that Kat could join her on her next run, a journey across the frozen Manitoba lake known as the "winter road." But at the last minute she changes her mind. Kat, who has recently been diagnosed with diabetes, stows away in the back of the semi instead. By the time her mother discovers her, it's too late to turn back.