In the series finale, the S.C.U. investigates the death of a Native American found under a bridge on the Wabacooche reservation, and Amy's new boyfriend, an Indian Reserve Police Captain, wants to work the case. Backstrom learns that a Cooch County meth czar is a suspect, and that Backstrom's Cooch County Sheriff father may be aware of the dealer's doings. Meanwhile, Backstrom need to impress Dr. Deb in order to keep his job.
Valentine's abuser is found murdered on Backstrom's doorstep and the investigation leads to a ring of wine smugglers, a dirty river-patrol cop and a government official. Meanwhile, Valentine's sketchy testimony makes catching the killer more difficult; and Amy's new boyfriend is not to Backstrom's liking.
Evidence in the investigation into a hit-and-run that left a wealthy woman dead points to vehicular homicide and uncovers a controversy involving her charitable work. Meanwhile, Backstrom's unhealthy habits disturb his doctor and his ex-fiancée.
An oil-pipeline explosion in Backstrom's childhood hometown looks to be the work of ecoterrorists, and brings back his estranged father, Sheriff Blue Backstrom, to assist in the investigation. The father-son reunion reopens old wounds, and a late-night visit from Everett's former fiancée further complicates his personal life.
The unit is under the gun and has only three days to rescue a teenage girl abducted by an online predator, and the case hits close to home for Backstrom, who is jarred by the girl's resemblance to a victim of an unsolved case that dogged him seven years ago. Meanwhile, Det. Sgt. John Almond's church stares down eviction after he missed the last three rent payments.
Backstrom considers the murder of a drag queen and blogger, who's a prominent member of Portland's LGBT community, a hate crime, and the case takes a surprise turn when Backstrom's gay tenant becomes a suspect. Meanwhile, Backstrom is pulled before the Civilian Oversight Committee as the result of his shooting a suspect in a previous case. To complicate matters, his former fiancée is in charge of the group.
The unit investigate when a youth pastor is murdered in the church, and there is suspicion the killing could be the work of a cult. Meanwhile, the Chief of Police recruits Backstrom's former fiancée to run a newly formed Civilian Oversight Committee tasked with investigating questionable conduct within the bureau.
An arson investigator enlists the S.C.U.'s help after a firebug's latest crime gets escalated to attempted murder when it involves a family. Although evidence points to a local, Backstrom believes it may be someone who's the least likely suspect. Meanwhile, Valentine tries to help helps Niedermayer recover stolen evidence.
Crime series about the troubled but brilliant Det. Lt. Everett Backstrom, who returns from exile to run a special-crimes unit in Portland, begins with the investigation into a college student's suicide, which may actually have been a homicide. Later, Backstrom bangs head with his doctor, who promises to fail him on his physical if he doesn't start making better dietary choices.