NO EXIT a gripping thriller full of heart stopping twists

Darby Thorne is a college student stranded by a blizzard at a highway rest stop in the middle of nowhere. She's on the way home to see her sick mother. She'll have to spend the night in the rest stop with four complete strangers. Then she stumbles across a little girl locked inside one of their parked cars. There is no cell phone reception, no telephone, no way out because of the snow, and she doesn't know which one of the other travelers is the kidnapper. Who is the little girl? Why has she been taken? And how can Darby save her?