Sharon Horgan stars as Helen, a falsely imprisoned woman who remains blindly optimistic in the face of an uncaring outside world and an insane prison life. She is joined by Jennifer Saunders as a deranged, "sexual Margaret Thatcher" prison governor, Bryony Hannah as her arsonist cellmate, and Geoffrey McGivern as her useless lawyer.
Helen is moved to D Wing where she becomes friends with, much to the upset of Christine. Helen hopes that she will be released now that her alibi and fiancé Justin has been located. Margaret finds out that she is being transferred to a new prison. Henry makes a gruesome discovery.