Married by Mistake follows Riley (Bennet) who, after learning that her dream job has fallen through, has a drunken night out with her best friend, Nate… (Penner) only to find herself the next morning in Las Vegas and married. With no job prospects on the horizon, Riley takes Nate up on his offer to move back to his hometown in Tennessee to help rescue his family’s business. Riley’s determination to make a name for herself in the company is complicated by the arrival of Nate’s ex-girlfriend and his attractive older brother. Will Riley and Nate be able to keep up the ruse, or will romances both new and old get in the way?