Patty begins to question Ellen's motives for returning to the firm; Patty tries to stop a corporate merger that she thinks is connected to Christine Purcell's murder.

Claire risks everything to oust CEO Walter Kendrick; Ellen discovers a secret about Patty's personal life.

Patty and Tom continue to dig into the Tobin family's sordid past, while Joe Tobin must decide between his family and his integrity. Ellen aids Tom in his investigation of the Tobin's, but in doing so receives some bad news of her own. While locked in the midst of a bitter divorce, Patty and Phil find one piece of common ground in the form of their beloved dog.