Back in town, Maggie frets about how Rooster's been running the bar. Abby considers a career change.

A job opportunity in Denver threatens to drive a wedge between Colt and Abby. Maggie pushes back about the pipeline.

Maggie takes a stand that lands her in hot water. Colt and Rooster come up with a plan to buy the Peterson ranch, but they need Beau's buy-in.

Beau shrugs off the doctor's orders and resists the family's efforts to help him. Meanwhile, Colt lashes out at Maggie.

Beau leaves the boys hanging about the Peterson ranch. Rooster takes Jen on a date. Colt and Abby fight about their future.

While Abby's in Denver teaching, Colt works to rebuild the Peterson ranch. Rooster misses his first day of work.

After a fight with Nick lands Colt in hot water, Mary presses her ex for the truth. Beau delivers troubling news.

Beau intervenes to keep Colt out of trouble. Abby and Colt follow a lead. Maggie returns to Garrison, and Mary wrestles with guilt.

One month later, tensions run high as Colt and Abby scramble to get ready for the baby. Lisa Neumann makes Beau an offer.

Colt tries to keep his cool as he worries about Abby -- and wonders if he's ready to be a dad. Maggie catches Mary in a lie.

While Abby and Colt struggle with parenting an infant, another new arrival shakes things up at the ranch. Maggie confronts Mary.

Beau's softer side emerges when he takes Luke under his wing, but Colt doesn't trust his cousin. Maggie comforts an exhausted Abby.

Money troubles put a strain on Colt and Abby's relationship. Beau tries to get Luke help for his PTSD but refuses to bail Colt out of a jam.

Colt hides the truth from Abby as their financial woes go from bad to worse. A drunken night leads to an awkward morning after for Mary.

Beau issues Luke an ultimatum. As Colt tries to prove himself to Abby, Luke makes him an offer -- but Mary drives a wedge between them.

Abby asks Colt for space, but he finds every excuse in the book to drop by. Luke and Mary tie the knot in Vegas. Lisa Neumann accuses Colt of theft.

Back in Colorado, Luke works to win back Colt and Beau's trust. Abby invites Colt to a teachers' mixer. Mary struggles to stay clean.

Beau gives Colt a taste of his own medicine. Mary asks Luke for help paying the mortgage. Colt confronts Abby about not getting to see Peyton.

Joanne shares difficult news with Beau. Abby helps Colt with a business idea. When Mary goes missing, Heather takes drastic measures.

Out on bail, Mary breaks into her old house to grab her stash. After a talk with Dale, Joanne has a change of heart. Colt and Beau confront Lisa.

At Colt and Luke's encouragement, Beau and Joanne plan a celebration. Abby asks Colt to go to counseling. Mary's downward spiral continues.

Colt asks Abby to lie to the police. Joanne and Beau have a heart-wrenching talk about the future. Mary tells Luke she wants to go to rehab.

Abby and Beau pressure Colt to take Lisa's deal, but support from the local ranchers leads him to waver. Stress causes Luke to lash out.

Colt tries to round up the other ranchers to give Neumann's Hill some competition. After another argument with Abby, Colt signs the divorce papers.

Colt, Beau and Luke bond during a road trip to New Mexico. Back home, Abby runs into Mary and Nick.