When Emily Long agrees to be in her friend's wedding, she doesn't plan on backing out a few weeks before the ceremony and merely going as a guest.

Being charmed into a one-night stand with a flirty groomsman also wasn't on her list of things to do. But the morning after the wedding, she finds herself hung over and wrapped up in Brian Stratford's bedsheets.

Several weeks, a positive pregnancy test, and an ultrasound later, Emily finds herself on Brian's doorstep questioning how her life ended up where it is.

As the new couple processes how to co-parent without loving one another, Emily's fate takes a turn for the worst.

It isn't until years later when Brian finds out what happened ...

and that Emily left letters behind for the people she loves most.