Life is moving fast for whip-smart high school senior Deidra and her younger sister Laney. Graduation looms, their part-time dad is a full-time schemer, and adolescent embarrassments arrive daily -- just like the train that rambles noisily through their backyard. But things take a turn for the worse when their mother Marigold is thrown in jail for a minor offense after succumbing to the pressure of single parenting. To help her struggling family, Deidra hatches a plan to start robbing trains. Things go off without a hitch, until a railroad detective starts sniffing around.