Fox stole comes alive from around a ladies neck

After five (or six) years of vanilla-wedded bliss, ordinary suburbanites John and Jane Smith are stuck in a huge rut. Unbeknownst to each other, they are both coolly lethal, highly-paid assassins working for rival organisations. When they discover they're each other's next target, their secret lives collide in a spicy, explosive mix of wicked comedy, pent-up passion, nonstop action and high-tech weaponry.

Happily married for three years, Ann and David Smith live in New York. One morning Ann asks David if he had to do it over again, would he marry her? To her shock, he answers, "No". Later that day, they separately discover that, due to a legal complication, they are not legally married.