Carrie, Charlotte, and Miranda are as tight as ever, but Samantha, having fallen out with Carrie after being dismissed as her book publicist, moved to London and cut off contact with everyone.
After discussing how to handle change, Carrie is challenged to be "sexually" open on ache's podcast. Miranda has a disastrous first day of school, and Charlotte tries to impress a fellow mom. And then - another Big change no one saw coming.