Caroline hires Richard as her new colorist, and takes Annie's advice to try getting a date by throwing fruit out her window.

Caroline must face dinner at Remo's with Del's parents alone when Del doesn't show up; Del is trapped on a stalled subway with Charlie, who insists on sharing his ideas for greeting cards for pets; and Richard's non-plans for his 30th birthday change when Annie visits to exchange swapped video rentals.

Caroline is annoyed that Del refuses to accompany her to the opera; then her interfering Aunt Mary arranges a blind date with an old high school classmate of Caroline's, who turns out to be handsome, successful and rich.

When Richard learns of Del's proposing to Caroline, he goes searching for another job, and is seduced by his just-divorced employment counselor; Remo and Annie try to convince a skeptical Caroline that she's oblivious to Richard's feelings for her - and hers for him.

Caroline's writers' block sends her down memory lane to Richard's first day on the job---a day with trouble in store for Caroline because she and Del had just rekindled their romance.

Three months have passed, and Caroline is thinking about advertising for a new assistant, so Charlie tries to demonstrate he would be perfect for the job and knocks Salty out the window. Sparks fly between Caroline and the vet who treats Salty, despite her fears that at 24 he is much too young for her. Meanwhile Richard, having failed as an artist in Paris (his only customer is knocked into the Seine just before buying some paintings), returns to New York and is forced to take a menial job in an ice cream parlor, where he just misses seeing Caroline on her first date with Joe, during which they helped raid an animal experimental laboratory and were arrested. (One of the participants is Shelly, still wistful about Richard, in her final appearance to date.) Caroline wakes up in bed with Joe and is unable to sneak out before he wakes and demands to see her again that evening, and on her way home she and Richard suddenly meet face to face.

Realizing Caroline never received his love letter, Richard labors to retrieve it from her friend's apartment.

Richard's father asks for his son's help in reviving an old comedy routine.

While they wait for Chinese takeaway delivery, Richard shows Caroline a family wedding ring he was planning to give to Julia, and soon after, the heirloom seemingly disappears from her apartment -leading Fong to accuse, and throw out, his delivery boy son Tim, who takes up residence in Caroline's living room. Meanwhile, Del and Charlie scheme to climb to the top of the Rockefeller Center Christmas tree to place a large ad for Caroline's line of holiday cards; and Annie develops a cabaret act and is attracted to hunky guitarist Paul, while oblivious to pianist Seth's growing infatuation with her.

As Caroline and Richard prepare to leave for Italy to visit his newborn son, Richard makes a confession that gives Caroline second thoughts about their future together: he never wanted to have children. But when he arrives alone in Italy, Richard discovers that Julia has abandoned the baby, and slowly becomes a model father. Meanwhile, Annie and Del begin a clandestine relationship. Flashing forward six months later, the series finale finds Caroline headed to the altar with Randy, when an unexpected guest arrives during the wedding ceremony: Richard, holding his infant son...