Catriona Masterton's fiancé, Ethan, is Normal. He plans trips six months in advance and arrives at the airport a minimum of three hours early. He purchases life insurance, luggage insurance, and always opts for the extended warranty. He's responsible, reliable, and would make any woman a wonderful life partner. In other words, he's the exact opposite of the Masterton clan. Cat's mother has a kitchen gadget fetish, a father whose best friends are taxidermied field mice, and a super stoner man-child brother who lives—where else?—in the basement. Then there's Nan, her proud Scottish grandmother with a proclivity for profanity and mischief. What on earth will Catriona's Normal fiancé think when he comes home with her to meet her parents? What will he think when he discovers his soon-to-be in-laws invited Cat's ex to join them for a holiday dinner?