After years apart, four former couples embark on a reunion with the ex-partner they have been unable to forget; none of the couples know for certain whether their ex feels the same way about them.
The couples go on another date and delve into a box containing good and bad memories from their past; emotions run high as they revisit their relationships to discover where they went wrong.
The ex-couples move in together and speculation is rife as to whether or not it will bring them closer together or tear them apart; a letter with a big secret could mean the end for one couple.
All of the exes unite for an all boys' and girls' night out to discuss their relationship statuses; during the evening, secrets are exposed and one revelation leaves everyone shaken.
After spending the week together, the couples swap houses and show what lengths they are willing to go to in order to please their partners; alarm bells sound in North Carolina; Peter and Diane attempt to handle daily life together.
The couples are sent on the trip of a lifetime for one final opportunity to reignite the spark before they decide whether they can find love once more, or if their issues are too much to handle.
