Anna's fear of flying has her and two friends making the trip on the maiden voyage of the Sunset Limited train instead, from her hometown of New Orleans to Orlando when her job requires her to travel. Unbeknownst to Anna, a celestial battle is waging, as the angel Andri-el strives to protect her from harm, while the demon Lu-seth tries to cause her harm. This battle goes so far as to become partly responsible for the outcome of the fateful train trip, as the three friends struggle to survive physical calamity.