In the series finale of Big Love, Margene plans on going on a cruise by herself to help people, Barb prepares to get baptized in the new church, and Nikki fears that she will be left alone if Bill goes to prison.
Alby gets Adaleen on his side against Bill and his family. Rhonda asks Ben to marry her which results in Ben & Heather breaking up. Bill faces the possibility of a 20 year sentence, as his family tries to cope. Cara Lynn breaks down after Nikki tells her that Mr. Ivy never loved her.moreless
Barb's mother is unhappy about the ally that Barb chooses to help her in the quest for priesthood. Cara Lynn continues to get closer to her math teacher. Bill faces Mormon boycott of his stores and also recieves a warning about Alby coming after him.
Bill finds success in the Senate but finds new roadblocks set up by the Mormon church. Barb comes to a new conclusion about her life. Cara Lynn's adoption faces a new obstacle. Lois recalls her past with Frank.
As Bill's swearing-in ceremony nears, he deals with opposition from his new colleagues. Marg and Nicki are unhappy with Barb when she makes an appearance at a First Ladies fashion show. Rhonda returns and tries to play hardball with Alby. Also, Marg and Pam start their business venture.
Christmas means trying times for the Henricksons as Barb, Margene and Adaleen come forward with shocking information. Cara Lynn looks into the disappearance of her father. Lura tries to stop Alby's extreme measures.
Now that his family's polygamy is in the public eye, Bill tries to get more polygamists to come forward. CaraLynn's abilities in math garner special attention. Barb tries to convince her mother to partake in a mother-daughter symposium.