Harry Bosch finds out one of his old cases is up for review and worries that all the cases since might be questioned. In another part of town, thugs in masks murder a pharmacist.

Detective Harry Bosch swings by the DA's office under the pretense of seeing Maddie. He encounters CIU Investigator Christina Henry who is spearheading the Borders petition based on a deathbed confession from another convict, Lucas Olmer. Bosch tells Edgar about Henry and wonders if the DA would really hang a case solely on another convict's word. If Borders goes free, all of Bosch's convictions will be questioned. Back at the station, Bosch and Edgar get a lead on the Esquivel murder: suspicious prescriptions written by a Dr. Garcia. Det. Pierce tells Bosch that the killers fled to a parking garage where they may have jacked a new ride. Pierce investigates a missing person report that fits their timeline while Bosch and Edgar head to Esquivel's house to look for Jose Jr. At the same time, Det. Robertson catches a homicide and finds a stripped car in Newton. Could the two crimes be linked? Bosch talks to Chief Irving about Borders. Irving led the task force in 1996 and Bosch found the key piece of evidence in the killer's apartment - a pendant Skyler wore. Irving promises he has Bosch's back. When Irving follows up with the DA about the body cam footage, he asks about Borders. She says they have new DNA evidence and if it matches Olmer, they'll support the petition for release. Maddie defends her father's case against Borders to Galligan, and he upsets her by suggesting that Bosch manipulated evidence to make the conviction stick. Later he apologizes, and they head to a bar to get better acquainted. Edgar meets his CI, Gary Wise, while Bosch meets with Chandler and her investigator Hector Bonner. Chandler insists Bosch let Bonner handle things, so Bosch and Edgar stake out the Garcia Pain Clinic. A white van pulls up and a dozen addicts get in. Bosch and Edgar follow the van on a pill run. Desperate to flee, Jose Jr. asks his cousin Oscar for money, a car, and a gun. Irving informs Bosch that the DNA matches Olmer. Borders might go free.

Bosch investigates new evidence that may overturn Borders' conviction, but he remains convinced they locked up the right man. Lieutenant Billets is forced to deal with Crate and Barrel's role in the accident at the pharmacy crime scene.

Robertson finds a lead on two suspects in the pharmacy shooting. J. Edgar tries to get some background on Gary Wise who was obviously in deep trouble. Crate and Barrel are unhappy with their new assignment. Pierce and Vega get information on the whereabouts of José Jr. Bosch looks into the old Borders case and finds several hints that the Olmer confession was bogus. Going undercover, he manages to get in a support group in a VA hospital and subsequently befriends a fellow veteran who can bring him in touch with the Garcia clinic.

Louis Degner brings Bosch (as Dominic Reilly) to the Garcia Pain Clinic, where Bosch is surprised to be examined by none other than Dr. Hansen from the VA. Hansen sees Reilly as nothing more than a pathetic addict. He gives Bosch a few pills and sends him home, saying they'll be in touch when it's time for Bosch to repay the favor. Seeking answers to his CI's killing, Edgar follows up with Gary's old gang contacts - men who spent time in jail after Gary flipped on them following a robbery 20 years ago. Robertson and his team search a warehouse where they find the pharmacy killers' getaway car and a link to the shell company that owns the shill plane - Western Sandblast. Hoping to rattle someone into making a mistake, Bosch visits Borders in prison while Bonner confronts Rita on the outside. Borders' cocky demeanor changes when Bosch lets him know they've been talking to his wife. Maddie, finding herself emotionally drawn into a rape victim's trial, considers the intricacies of justice, as Barrel considers Billets' suggestion that it's time to retire. Bosch updates Chief Irving on the Borders case. Bosch believes Olmer's attorney, Lance Cronyn, stealthily obtained Olmer's DNA during one of his many visits. After Irving provides Bosch with video from the LAPD property room where a key piece of evidence was handled, Honey Chandler and Bosch figure out how Olmer's DNA was then planted by a property clerk named Spencer. While weighing an opportunity to run for Mayor, Irving provides DA Hines with a potential alternative bringing criminal charges in the officer-involved shooting. CIU Investigator Henry searches for evidence to back her belief that Bosch planted the seahorse pendant to frame Borders -- just as Irving shreds a document involving the very same evidence.

Spooked by her encounters with Bonner, Rita visits her husband Preston Borders in jail. Borders believes Bosch is behind Bonner's visits, and tells her to have Cronyn deal with it. Bosch and Chandler try to figure out how property clerk Terry Spencer is involved with the Cronyns. On a hunch, Bosch calls Cronyn's office posing as Spencer. Cronyn demands to know why Spencer is calling him. "I'm not your contact." Later, Bonner watches Rita meet with Cronyn's wife, Kathy Zelden. The circle of conspirators appears complete. While Christina Henry looks through the same case files that Irving recently tampered with, her friend Lt. Torres probes her more personal reasons for targeting Bosch. Crate and Barrel discover someone is manipulating the city's crime stats. They bring the worrying news to Lt. Billets. Pierce and Vega can't find Jose Jr. While searching a warehouse the pharmacy killers may have used, one of Robertson's team members nearly dies from exposure to traces of Fentanyl. At city archives, Bosch looks at the Skyler case search warrants and realizes the before-search photo from Borders' bedroom is missing. He remembers that Irving entered the apartment with a photo team before Bosch discovered the seahorse pendant. After Bosch learns both Henry and Sgt. Wash also have been in the files, he asks Irving about the missing photo. The Chief stonewalls him. Bosch arrives undercover at the Garcia Clinic, and goes on a pill run. Edgar and a second detective follow the van, but they have to back off once their cover is blown. Instead of returning to the Clinic, the van heads to Whiteman Airport. Edgar arrives just in time to see the twin otter climb into the sky, his partner on board.

Stuck now at the desert shill encampment with no easy escape plan and no way to communicate with Edgar, Bosch befriends Clayton and searches of information about his murder suspects. He learns about the death of her daughter, Daisy. Maddie, still raw from losing her mom and fearing the worst, asks Billets about where her dad may be. That Bosch is still undercover is news to Billets, but she reassures Maddie that everything will be okay. Pierce and Vega, concerned that the pharmacy killers have also learned Jose Jr.'s hiding spot, head to Bakersfield to find him. They intercept one of the killers who's there to tie up the loose end that is Jose, Jr. While Cronyn assures Borders that Bosch will play no role in his upcoming hearing, Chandler lays legal groundwork with a visit to her good friend Judge Sobel. Billets and Mankiewicz realize just how far up the chain of command the manipulated crime stats might go, forcing Billets to wrestle with what she'll do with the information. On a pill run back in LA, Bosch gets Clayton arrested, hoping to use her to get a message to Edgar. On return to the compound, however, Walsh has grown weary of Bosch, and Bosch finds himself in another dangerous jam. Edgar, researching the Haitian businessman he saw with Marcos and Arias, gets a call about Clayton's arrest, and the note she carries from Bosch. Scott Anderson gets tipped about police misconduct, and Cronyn suggests Bosch planted evidence to frame Borders for murder. Anderson seeks corroboration with mixed results. But lacking only a statement from Bosch, Anderson's editor decides to run the story.

Detective Edgar questions Clayton in an effort to locate Bosch. Clayton suffers serious addiction withdrawal, but remembers some details that may prove helpful. The LA Times article about Bosch and Borders has blown Bosch's cover. Walsh sends Bosch out over the Salton Sea to be killed, but Harry turns the tables on his would-be killers. A worried Maddie reads the article about her father, and, his whereabouts unknown, fears the worst. As Billets insists they inform LAPD command and local authorities that Bosch has gone missing, the call comes in that Bosch is heading back to town. Spencer's now in the wind, but Chandler suspects he's someplace the Cronyns control. DDA Kennedy accuses Christina Henry of being Anderson's source for his Borders expose. Though she denies it, he cautions her not to let her personal feelings about Bosch cloud her judgment. Chandler and Bosch uncover more details about how evidence was manipulated in the Borders case. Pierce and Vega nail Hart in the pharmacy murders. Irving tries to persuade the DA not to pursue the officer-involved shooting. He promises to deal with it internally, and her fair treatment of the cops could go a long way toward securing her political future. Then the Chief makes a rare appearance at Hollywood Station - seeking the truth about Bosch's undercover adventures in the desert. Edgar realizes a key witness to Gary Wise's murder is hiding in plain sight.

Bosch and Chandler track down Spencer, and try to persuade him to turn on the Cronyns in order to save himself. DEA Agent Hovan interviews Hart, who teases some additional useful information about the real mastermind behind the killings. Pierce and Vega catch a gruesome new homicide. Christina Henry continues her pursuit to have the DA look into possible criminal misconduct by Detective Harry Bosch. Crate plans Barrel's retirement party. Edgar finally tracks down Bo Jonas, who provides new clues about Gary's murder. At Hollywood Station, Captain Cooper convenes Lieutenants Billets and Thorne, wanting to confirm everyone's on the same page regarding the doctored crime stats. Chandler asks Bosch what Henry has against him, believing she can exploit Henry's personal animus at the upcoming hearing. The hearing begins. To the surprise of DDA Kennedy and the dismay of the Cronyns, Chandler is able to convince Judge Sobel that Bosch has standing. Tension mounts as she presents her case, and Borders unravels and exposes the entire scheme behind the case. Maddie tells Bosch she's decided to go back to school early. She reveals that what she really needs is some space - from him.

Pierce and Vega find more body parts, and tie their murder to an ongoing RHD case. Maddie tells Bosch she sent the memo to Chandler, and doesn't regret it. Edgar knows who killed Gary Wise, but can't prove it.