Carrie is tormented because she can't stop thinking about Aidan. She admits to the girls that she wants him back. Miranda suggests emailing Aidan. Carrie gives it a go and writes "I miss you" in her first message to Aidan.

Miranda meets a cute guy, aka "Marathon Man," in her running group and they arrange to go for a run together, which leads to a post-workout workout. Miranda is surprised when Marathon Man puts his tongue where no man has gone before. Charlotte has other things on her mind as she and Trey talk about having a baby. However, when she invites over a couple with three kids, the reality of parenting looks a little less appealing and Charlotte and Trey take a break from their attempts to procreate.

After 36 hours, Aidan still hasn't responded and Carrie breaks down and calls him. She arranges for them to go out with Miranda and Steve. After dinner, she tells Aidan that she wants to get back together with him. Aidan says he can't do the relationship thing. Undeterred, Carrie returns to his apartment later that night and tries to convince him to give her a second chance. Aidan finally just screams, "You broke my heart" and Carrie runs home again.

Over at Miranda's apartment, Marathon Man not so subtly tries to get Miranda to do some reciprocal licking, but she realizes she just can't. At the next marathon training session, she races right past him. Samantha, who has been sleeping with MBA man, Warren, is turned off by his baby talk in bed. When she suggests he stop, Warren takes offense and storms out like the big baby he is. Speaking of babies, Charlotte and Trey decide that one baby will be okay and get back to work.

Back at Carrie's place, Aidan shows up and without any words, the two have passionate sex. In the morning, Carrie tells him that she still loves him and wants to be his girlfriend, but Aidan says he needs to think about it. Later that day, Aidan returns and says, "Ok, let's give it a shot."

The girls meet for lunch to catch up and Carrie reveals that she and Aidan have exchanged keys to each other's apartments. When Carrie goes home she's touched to find Aidan cooking in her never before used kitchen. She also discovers that her computer has crashed and she can't access any of her files. Aidan chastises her for not backing up her material. They bring her computer in to a repair shop and the techie tells her it doesn't look good.

Miranda has to go to Philadelphia because her Mom has had a heart attack. The next day her Mom dies. Miranda calls Carrie to let her know and trying to be strong fights back tears. Charlotte, who has become a regular Martha Stewart, takes charge of getting the best funeral fruit basket and flower arrangement. Samantha has trouble dealing with the news of the death and can't bring herself to call Miranda. Instead, she gets together with her latest man, Nick, a NYU wrestling coach who had been teaching her new positions. However, this time, no matter what moves they try, Samantha can't orgasm. The next day, determined to get off, she pulls out her trusty vibrators but no luck. Miranda goes shopping for a funeral dress and after screaming at the lingerie saleswoman, she breaks down and cries in the woman's arms.

Aidan surprises Carrie with a new laptop computer and zip drive but Carrie isn't happy about it. She's used to taking care of herself and can't handle the implications of his gesture. They argue and Aidan gives her back her keys. Back at the computer repair shop, Carrie learns that she needs her "motherboard" replaced. She calls Aidan and admits that she's scared to let him in, in case they fall apart.

The girls go to the funeral in Philadelphia and offer Miranda their full support. In the middle of the funeral, Samantha starts crying and finds the release she really needed. She finally says, "I'm sorry" to Miranda. Back home, Carrie lets go of her fears and starts using the zip drive that Aidan gave her.