What do you do when the only spark in your marriage comes from the candles on your five year anniversary cake? Kate and Damien were the perfect couple and good at loving each other–until they tied the knot. Now the only thing they're good at is fighting about who let the laundry sit, or debating the guilty party behind the burnt mac and cheese. After five years of dating her husband, Kate thought she had found her perfect match, but as the arguments become serious, the rift between her and Damien grows and she finds herself falling for the stranger next door, Cy Edwards.

Before long, Cy and Kate are seeing each other, until one day Kate finds herself on the opposite end of the pole–she catches Damien with another woman! Is it too late to salvage her marriage? Will Kate and Damien make it through "for better or for worse"?