Plum discovers that Gavin is the new teaching assistant assigned to her class; Valerie comes to the rescue when an attractive divorced friend tries to seduce Frank; Plum convinces Paulie to sit for the sergeant's exam, despite his lack of confidence; Lydia meets Gavin in the library and, unaware that he's Plum's ex-boyfriend, invites him to be her ""non-date"" for Plum's birthday party.
Lydia and Mack decide to move in together; Dolly and Frank are unhappy and decide to use reverse psychology on their daughter by pretending to like Mack; Jackie worries that Adele won't be able to cope with running the salon in her absence; Lydia begins to lose interest in Mack when she learns that he doesn't want children; Adele throws Jackie a surprise baby shower; Mack moves out of Lydia's apartment; Jackie goes into labor at the salon and Eric delivers her baby with the help of Dolly and Lydia.
As Paulie's birthday approaches, he discovers that Jimmy is gay; Lydia finds a new apartment right above the Cucina, and reunites with Mack; Frank and Dolly get an unpleasant surprise when they enter Lydia's new place without knocking; Lydia discovers that Jackie and Mack had a brief affair fourteen years ago.