Fiona goes off the rails, violating multiple terms of her probation by partying with Robbie's degenerate friends. When the family doesn't hear from her, it sends them into search-party mode, not unlike their past experiences with Frank. Sheila prepares for her wedding to Frank, who undergoes an illegal liver transplant... or does he? Kevin's and Veronica's twins are born, but Kevin and Mickey butt heads over business. Bonnie and Carl get closer while committing crimes. Ian continues to spiral from one extreme to another.