While Bill seeks protection against the religious compound led by Roman Grant, things heat up between the sister-wives over Margene's overtly sexual behavior. Roman "The Prophet" asks Bill's father to act as a go-between to deliver a message to his son, and the Hendricksons get together for a family dinner with Bill's business partner and his three wives. Meanwhile, Margene pressures Bill about buying her a car and Ben goes out on a date with a girl that seems too mature for him.

Bill gets a new home security system, Nicki throws a birthday party, new neighbours move in, and Margene meets her mother-in-law. Meanwhile, there's a break-in in Bill's hardware store.

Nicki suspects that Bill is having an affair and is considering bringing a fourth wife to the family. Margene, feeling alone in the big house, befriends the new neighbor, Pam Martin. Bill goes after Roman and tries to expose him, but polygamy accusations also fly in the Home Plus. Meanwhile, Ben is trying to cope with his arousing sexuality and being a teenager.

Bill attends the funeral of Frank's first wife Roberta at Juniper Creek, and strikes a deal with Roman. With Roberta out of the picture, Bill's mother Lois attempts to rise up on the social ladder at the compound, and Barb and Nicki find themselves in a hairy situation at Henrickson Home Plus.

Bill considers running an expensive advertising campaign, Barb finds out about Nicki's secret, and Margie goes to church with Pam, their neighbor. Meanwhile, Sarah brings home a surprise guest, and Ben goes on a trip with his friends.

Bill and Roman's disagreements result in lawsuits from both sides as well as unwanted houseguests from the compound. Sarah learns about her family's history from her grandmother and Joey confides in Barb.

Bill wants to throw a party to celebrate Don's plans of getting a fourth wife but Nicki's massive credit card debt weighs heavily on his mind. Pam's friend attempts to make his moves on Margie, but she is preoccupied with wanting to know more of how she became a part of the Henrickson family.

The Henrickson's prepare Teenie's baptism with friction and surprises from Barb's judgmental sister. Bill decides to take preemptive action against Roman with his brother. Margene continues to butt heads with Nicki, and her misfortunes pile up. Ben wants to show his affection to Brynn but is surprised when she demands something more.

Both Bill and Barb get social recognition as Barb is selected as a finalist for a "Mother of the Year" award and Bill is asked to become a member of the Salt Lake City Leadership League. Meanwhile, the sister-wives draw up their wills, and Rhonda gets to know what life outside the compound is like for teenage girls when she hangs out with Sarah and Heather.

After they're outed as polygamists, Barb decides to leave the family while Bill starts an investigation of who leaked the information. Meanwhile, Sarah attends a support group for ex-Mormons

Nicki goes back to the compound for a family reunion, bringing Bill with her, where they find out the extent of Roman's betrayal of their family. Barb is annoyed by Margene and Ben's behavior. Meanwhile, Alby disobeys his father.

Bill and Roman butt heads when Rhonda disappears from the compound. The prosecutor offers Joey a plea bargain in exchange for a confession. Meanwhile, Sarah takes an interest in a boy from her support group.

Bill attempts to sign the deal on the video poker devices before Roman. Joey and Wanda are having a rough patch and Joey wants Barb to help them. Meanwhile, Nicki's upset with the Catholic summer school Wayne is attending. Finally, Bill is captivated by a pretty waitress.

Margene plots to introduce Barb and Nicki to Bill's next potential wife. Meanwhile, journalists take an interest in Rhonda's story.

Margene's mother visits the family. Scott has upsetting news about Alby. Meanwhile, a familiar face returns to Juniper Creek.

Bill is stressed out by work, and Frank tries to get a hold of Lois' money. Meanwhile, the family discovers Ben and Brynn's secret.

Bill seeks his wives' advice regarding the video poker business. Barb tries to reconcile things between Sarah and Heather. Meanwhile, Lois seeks revenge on Frank.

Bill takes Margene to a convention. Frank is looking for a new wife. Meanwhile, Nicki throws a party.

Barb finds out that her mother is about to re-marry. Bill hears disturbing news about Weber Gaming. Meanwhile, Nicki is upset by outside influences on her children.

In the season finale, the family prepares for the annual Pioneer Week. Bill and Alby butt heads over the control of UEB. Meanwhile, Margene reveals the truth to Ana.

Bill, Nicki and Cara Lynn travel to Washington, D.C., where Bill tries to land an endorsement from Congressman Clark Paley while mending things with Nicki. Meanwhile, Margene's on-air triumph is tempered by a case of mistaken identity; Joey goes to extremes to safeguard a secret; and Barb and Sarah hit a young Native American woman with their car.

Pressed by Coburn to state his intentions, Bill gets his family to stage an elaborate rally announcing his candidacy. He isn't so lucky when an audit uncovers insurance discrepancies caused by his multiple wives. To protect his secret and save his candidacy, he ends up asking Don to take the fall, and moves up his announcement by three days.