After a shocking revelation, Carrie and Big fall into their old habits, leading to a night of passion. Meanwhile, Charlotte achieves her goal and ends up engaged - but not the way she had hoped, Miranda and Steve find out that it is not easy to live with an ex when they start dating other people, and Samantha's 'pick of the week' leaves a nasty taste in her mouth.
Nate and Brenda take Maya on a train ride; Keith straightens out a conflict of interest; Federico starts sleeping on the job.
Ruth goes on a fossil hunt with George; Claire focuses her talents on Edie; Vanessa does some detective work.
Oz is in upheaval following the return of Martin Querns; Howell and Robson receive troubling medical news; Alvaraez succumbs to an enticing offer.
Three new inmates arrive, including someone close to the O'Reilys. Busmalis and Rebadow prove to be true Romeos, and the Keller-Beecher-Schillinger triangle becomes more pointed.