The play follows Beth and Cal, whose 20-year marriage is at a crossroads. One day, while attempting to sell 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 all 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.