As the town grows, a rowdier element is evident and the citizenry wants a little more law and order. Matthew believes he is suited for the job of sheriff but refuses to carry a gun which worries Dr. Mike.

When Sully is offered a job helping to survey the new National Park at Yellowstone in Wyoming, Dr. Mike is faced with the prospect of leaving her practice and all their friends and moving into the wilderness. With Sully no longer acting as the local Indian agent and banned from the Indian reservation, Dr. Mike realizes that it is important for him to have work that is meaningful to him. Leaving everything and everyone she knows and taking their new baby into the wilderness, however, is a daunting prospect for her. Meanwhile, as Matthew and Emma think about marriage, Brian agonizes about his first date at the Sweethearts' Dance, and Dorothy teaches Cloud Dancing some ball room dances while he provides her with background on Indian customs for a book she is writing.

U.S. Marshall Elias Burch asks Matthew, still a student of law, to defend him when he's accused of murder. Daniel is forced to arrest Burch for killing Exner, an ex-con whom he had been pursuing. Rather than accept a traveling defense attorney with a drinking problem, Burch asks Matthew to defend him, claiming he was framed. But, a fiction writer who had been traveling with Exner claims to be an eyewitness, having seen Burch shoot the man in cold blood. With Burch's life in the balance and little evidence to support his claim that Exner drew a gun on him, fledgling lawyer Matthew, with help from Dr. Mike, sets out to discover what actually happened between the two sworn enemies.

Michaela and Sully reminisce about the ups and downs of their relationship and make a momentous decision about their future. While returning from a week long trip with Sully, Michaela stumbles and falls, sustaining a head injury. The couple takes refuge in an abandoned cabin where Sully must keep Michaela awake to prevent her from slipping into a coma. Together, they reminisce about the myriad different experiences -- good and bad -- they've shared together and then make a pivotal decision about their future.

Robert E vents his frustration over the death of his son and the demise of his marriage by stepping into the ring with a traveling boxing champion. When boxer Barracuda Jim Barnes comes to town, Robert E, fueled by his anger, volunteers to take him on, surprising everyone by beating Barnes twice. But when Dr. Mike examines Barnes, she discovers that the champ is on the verge of losing his eyesight if he continues boxing and she implores him to retire. Choosing to reject the doctor's order, Barracuda goes into the ring with Robert E for what may be his last fight. Meanwhile, Sully's efforts to get Grace to reconsider the pending divorce from Robert E begin to pay off with help from baby Katie.