Mother Nora continues to be the glue that holds the dysfunctional Walker clan together as family members face a variety of challenges. Sarah finds new love with a mysterious Frenchman and learns to accept her father's longtime mistress, Holly Harper. Kevin has found his soul mate in chef Scotty Wandell, and the two are looking into expanding their family through surrogacy. Justin has dealt with his war trauma and started a new course, planning to marry Rebecca and attend medical school. Kitty and Robert work on holding their marriage together as they handle new parenthood in the wake of Robert's gubernatorial campaign. Saul tackles life as an openly gay man while looking after the newest member of the family, Ryan Lafferty. And Tommy has isolated himself from his family, fleeing to Mexico on a personal journey. Still, the loss of family patriarch William continues to affect their lives and decisions.