Beth and Cal's 20-year marriage is at the crossroads. One day, while selling their house, a younger and an older couple unexpectedly show up at the door. It seems innocent at first, but after a little while, it becomes apparent that they have way too much in common. They have crossed over into The Marriage Zone. Discoveries are made, secrets are revealed, and the result is a hilarious and poignant look at the life of a marriage.