In Matt’s kitchen, Edward discusses Lucy while eating champorado. He describes Lucy as rebellious and troubled from a young age. When she became pregnant as a teenager, she wanted an abortion, and Edward would have permitted it, but Matt’s grandmother insisted on keeping the baby and confined Lucy to prevent drug use during pregnancy.

Matt is devastated to learn they would have aborted him. Edward dismisses his reaction and claims that Lucy could not identify the father. Matt accuses Edward of lying about being the Butcher. Edward then reveals another lie: Lucy did not die of an overdose. She hanged herself when Matt was three months old, in the room that later became Matt’s bedroom. When pressed about his kill count, Edward estimates between 20 and 30 victims, with 17 as the Butcher, and tells Matt that they share dark, violent tendencies.

Sam arrives unexpectedly through the unlocked front door and joins them. She reveals that DNA evidence proves Bonnie’s killer and PJ’s killer are father and son. Matt panics, realizing the police will connect him to PJ’s murder. He confronts Edward, asking if he raped Lucy. Overwhelmed, Matt tells Sam that Edward is his father. Before either can process this, Edward strikes Sam in the chest with a cleaver.

Matt watches in horror as Sam collapses with the cleaver embedded in her chest. Edward is exhilarated. He tells Matt to leave Sam alone, but Matt rushes to her side. Sam, conscious but in shock, begs him not to touch the cleaver and to call an ambulance.

Matt realizes his phone is on the kitchen table behind Edward, and the house has no landline. Edward pockets his phone and taunts Matt, suggesting he finish Sam off and embrace his violent nature. As they face each other, Matt is struck by their identical physical features and horrified that he never recognized Edward as his father. Edward challenges Matt to take the phone from him, and Matt lunges forward.

At the Seattle airport, Sanchez receives an urgent text from another detective, Kellogg, asking him to call her. She reveals that the DNA from PJ Wu’s body has been identified as Matt Shank’s. Sanchez realizes that, based on the father-son DNA connection, Matt’s father must be the Butcher.

As his Sacramento flight begins boarding, Sanchez instructs Kellogg not to arrest Matt. He explains that the situation involves Edward Shank and must be handled delicately. He abandons his flight and heads back to personally manage the arrest.

Edward now holds both a gun and Matt’s phone. Sam lies silent on the floor, and Matt fears that she is dying. Edward explains that he orchestrated this confrontation because he knew Matt would eventually turn him in. He refuses to die in prison or a nursing home, preferring a dramatic end. When Edward asks if Matt would kill him to save Sam, Matt admits he would. Satisfied, Edward tells Matt to kill him.

Matt wrestles the gun away, and Edward offers minimal resistance. With the weapon aimed at his grandfather, Matt again demands his phone. Edward refuses, insisting Matt shoot him first. He reminds Matt that it will appear as self-defense since the gun is registered to Edward and bears his prints, as does the cleaver. Edward goads Matt further, recounting all his crimes, including raping Matt’s mother. Matt squeezes the trigger, and a gunshot rings out.

Arriving at Matt’s house, Sanchez hears a gunshot from inside. He calls dispatch to report shots fired, then enters through the unlocked front door. In the kitchen, he finds Sam on the floor with a cleaver in her chest, and Matt crouched beside her. Sanchez draws his weapon and orders Matt away from her.

After checking Sam and finding a faint pulse, Sanchez calls for an ambulance. Matt explains that Edward stabbed Sam and fled after Matt shot at him but missed. He reveals that Edward is the Butcher. Though initially shocked, Sanchez realizes the claim fits the facts.

As paramedics and police arrive, Sanchez issues a BOLO for Edward Shank. Matt provides details about Edward’s vehicle and, under questioning, remembers that Edward owns a hunting cabin in remote Raymond, Washington. He urges Sanchez to do what he could not.

At his cabin in Raymond, Edward waits for the police to arrive, estimating he has about an hour. He reflects on his advanced age and how close he came to being caught in 1985 before successfully framing Rufus Wedge.

In a flashback to April 21, 1985, Edward meets Wedge in a storage unit and promises him $75,000 if he accepts arrest as the Butcher. Edward assures him that the charges will not hold, but the arrest will satisfy public pressure. He reflects on his compulsive urges and how he targeted victims who resembled his daughter Lucy, whom he had sexually abused. After Matt was born, he resolved to stop, framing Wedge for his past crimes to close that chapter.

In the present, Edward hears helicopters overhead. He looks at his aged reflection, picks up his Remington rifle, and prepares for the confrontation.

After more than an hour of searching, Sanchez and a tactical team locate the cabin. When Sanchez calls out, the door opens to reveal Edward in full formal police dress blues, holding a rifle. Sanchez orders him to drop his weapon and surrender, informing him that he is under arrest for 17 counts of first-degree murder. Edward asks about Matt and Sam; Sanchez says that Sam will survive. Edward remarks that while he was neutral toward Sam, it felt good to stab her.

Edward refuses to surrender. He announces that he will raise his rifle, forcing them to shoot him. Sanchez pleads with him not to. Edward says it is too late, raises the rifle, and multiple officers fire simultaneously. Sanchez removes his helmet, looks at the fallen body, and quietly says it is over.

Five days later, Sam recovers in the hospital, watching extensive news coverage of the Butcher case. She has received numerous media inquiries and book-deal offers but rejects all of them, deciding she must properly grieve for her mother before moving forward.

Matt has been arrested for PJ Wu’s murder. Police found traces of PJ’s blood behind Adobo, and Matt confessed, claiming that the killing was accidental, and Edward instructed him to dismember the body. Sam finds the dismemberment hard to reconcile with the person she knew but plans to visit Matt in prison because he saved her life.

Jason visits with tacos. Looking at him, Sam recognizes the boy she has always loved. After some playful banter, his expression becomes serious, and his hand trembles slightly. Sam asks Jason to kiss her. He teases her briefly, then does.