In this Addison-centric episode, her role as a parent is challenged when Henry's biological mother reappears and asks to be more involved in her young son's life. Meanwhile Addison reconnects with her mentor, who shares a very painful secret.

In an episode told from Cooper's point of view, we follow him from the moment of conception through a nasty fight with Charlotte, which inadvertently threatens the lives of their triplets. Meanwhile, Violet comforts a friend who is being advised to take her partner off life-support.