After one totally out of character night with Bethany Caldwell, Gavin Riordan is torn. He desperately wants to pursue their relationship, but since he now has custody of his nine-year-old son, the little boy must be his priority. No matter how much he is drawn to Beth, the bad timing leaves him no choice but to put her out of his mind.

In Beth's view, Gavin's devotion to his son is an eye opener. His grumpy, perfectionist reputation in the emergency department preceded him, yet the man she'd met at that crazy resident party on the night her divorce became final, was, well, just what she'd needed - though the whole experience was a huge mistake! Best to leave it and move on. When Gavin's son Patrick needs help and she's the one to step in, she sees yet another side to the one-night-wonder of Gavin Riordan and is devastated to let him go. Then she discovers the unthinkable.

Unplanned and completely at the wrong time, their mistake could be the worst reason (or maybe the best?) for them to come together...as a family.