女主人公是一个卡车司机，生活自由自在，没有任何负担。然而因为父亲突然住院，她必须接回一直由其照顾的自己11岁的儿子。由于之前长期不在一起，女主人公和儿子之间的感情已经生疏，如今住在同一屋檐下的两人矛盾不断……Diane's free-wheeling life of drunken one-night-stands as a professional trucker hits a road block when Peter, her son, is dropped at her doorstep. Her former husband Len, whom she abandoned eleven years ago along with their new-born son, has cancer and no one else to turn to while he's in the hospital. Peter, resentful and wary, wants, even needs a mother who'll want him at this worrisome time but knows better than to expect this from Diane. With deliveries waiting and a mortgage to be paid, there's only one inevitable thing ahead for Diane and Peter - a road trip together.
