Bosch learns more about the dark past and murder of Billy Meadows. The credibility of a key witness threatens to undermine the Holland case. Edgar maneuvers to handle damning evidence. Dangerous men target Bosch.

Bosch clashes with his fellow detectives. Irving weighs his career options just as his personal life takes a turn. The killers behind the Meadows murder clean up loose ends. Questions swirl about whether Bosch is an avenging angel.

Bosch and Robertson work a promising lead in the Gunn case. Further evidence gets the team closer to solving the Meadows murder. Irving does damage control on another crisis related to Bosch. Edgar takes action. The Holland case is on the brink.

Bosch operates behind-the-scenes to expose wrongdoers. Killers are in the wind. Edgar deals with the fallout of a crucial choice.

Bosch's relentless pursuit in the Meadows case reaches a climax. Bosch and Edgar talk about a startling discovery. An unexpected visitor drops in on Bosch and Maddie. Harry learns that his history is far from settled.

Bosch and Edgar uncover more details about the pharmacy murder and the opioid operation, while Detective Robertson works a tandem homicide. As Bosch pushes back against the deathbed confession at the heart of Borders' petition for release, he enlists the help of a longtime adversary. J. Edgar tries to persuade a former CI to cooperate with an investigation.

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. Bosch and Edgar track the pill mill van to an unexpected destination, while Edgar gets shocking news about Gary Wise.

Nearly a year has passed and Bosch, still grinding on the Daisy Clayton murder case, gets called to the Lake Hollywood Overlook to investigate the murder of medical physicist Stanley Kent. Edgar runs a sting on his dirty cops, Maddie starts a new internship, and Chief Irvin Irving jumpstarts his mayoral campaign.

When cops discover the body of a homeless man covered in radiation burns, the hunt for the cesium intensifies but Bosch and Edgar wonder if their assumptions about the crime have been wrong all along. Maddie’s discovery earns Chandler’s praise. DEA Agent Charlie Hovan discloses his connection to Jamaican drug dealers with possible ties to Edgar’s dirty cops.

Bosch dives deeper into Daisy Clayton’s troubled past. Edgar scrambles to find evidence confirming Bosch’s suspicions in the Kent case. Hovan goes undercover to learn more about Avril’s criminal dealings. Crate and Barrel return to the Homicide table, but their celebration is overshadowed by bad news.

Six weeks later, Judge Sobel hears Chandler’s objections to Bosch’s key evidence against Alicia Kent. Irving’s new task force has a win. Hovan and Edgar are on the verge of bringing down Avril. Billets gets a call from IA, and while working his way through a list of new suspects in the Daisy Clayton case, Bosch uncovers a chilling connection.

Bosch closes in on a suspect in the Daisy Clayton murder as Elizabeth begins to unravel. Edgar discovers Avril is as cunning as ever, and worries he’ll slip away. The car czar makes a hard play to force Irving out of the mayoral race, and IA investigates the complaint against Billets. In Bosch’s crosshairs, Daisy’s killer makes a shocking confession.

Irving and Maddie make big decisions about their futures. Bosch and Edgar, having weathered unexpected tragedies, share bitter frustration with a system that has seemingly failed them. But with the motion hearing on the Kent murder case evidence at hand, they’re each faced with a choice: to let things go, or take matters into their own hands.

New Year’s Eve 2019. While Los Angeles celebrates, a fire breaks out in an East Hollywood apartment building killing several residents including a ten-year-old girl. When it’s determined to be arson, Detective Harry Bosch arrives on the scene but his partner, Detective Jerry Edgar, is noticeably absent.

Bosch and Edgar follow a lead in the arson fire case to the famed Magic Castle. Lt. Billets ruffles feathers in the officer ranks. After Chandler’s new client Vincent Franzen spends a night in jail, he offers up a “muy grande pescado” as his get-out-of-jail-free card.

Bosch and Edgar track down La Mayorista, but Bosch asks Vega to assist after Edgar makes a costly error. Chandler and Maddie record Franzen’s statement for the SEC before Chandler stashes him away in a safehouse. Irving and Lopez discuss the arson case, each concealing their true agendas.

Bosch is pulled away from the arson case to a double homicide in the Hollywood Hills and finds RHD Detective Jimmy Robertson on the scene. When the harassment of Lt. Billets escalates, Captain Cooper and Lt. Thorne are angry that she reported it to IA instead of talking to them. Maddie makes a shocking discovery. Bosch and Edgar try to get Alvarez to talk.

After discovering Alvarez has been transferred, Bosch enlists Chief Irving’s help. Pierce and Vega get a lead on the hitman. Billets reaches out to a former Hollywood cop for intel on Leonard and Norris. When Bosch and Edgar meet with Carl Rogers, Edgar lets a detail of the case slip, enraging Bosch.

After Maddie’s involvement with the Franzen case leaves her exposed, she must testify before a grand jury to stay safe. Irving asks FBI SAC Brenner for help with Alvarez, learning something useful about Peña. The little tamale girl’s father pays Bosch a visit; his pain strengthens Bosch’s resolve to bring her killers to justice. Leonard and Norris push Billets to the brink.

Robertson and Bennett follow the hitman’s trail to Las Vegas, hoping to find a connection to Fowkkes’ other clients. When Billets performs a security evaluation at a local jewelry shop, she gets more than she bargained for. Irving gives Bosch an order, causing Bosch to lose faith in the system he has defended his entire career.

As Billets posts the Hollywood homicide detectives’ new assignments, Bosch puts a plan in motion to arrest Mickey Peña, leading to some severe consequences. Billets makes an impression and Maddie makes a decision about her future.