LAPD homicide detective Harry Bosch is back on the job after a suspension. When a dead body found in the trunk of a car on Mulholland Drive appears to have mob connections, Bosch takes on a case that could prove his biggest challenge yet. George Irving has a new assignment. Deputy Chief Irving weighs his options.

Bosch discovers that his murder case has wider implications. Deputy Chief Irving tries to stay above the political fray. Danger escalates with George Irving's plainclothes position. Harry receives a tip relating to his mother's murder. The Tony Allen investigation sends Bosch to Sin City.

Bosch is drawn into the underbelly of Las Vegas. A reunion with his daughter reveals that all is not well on the home front. Deputy Chief Irving chooses a side in the mayoral race. There's more to George Irving's assignment than meets the eye.

Bosch nabs a murder suspect, while others keep a close eye on the investigation. After an encounter with Vegas mob boss, Joey Marks, Bosch faces questions about the past of someone close to him. George Irving makes important inroads. Deputy Chief Irving clashes with LA's political machinations.

Bosch and Edgar are now hot on Joey Marks's trail. George Irving is pulled deeper into his mission. And Bosch must go to extremes to ensure the safety of those closest to him.

Heightened circumstances create an unlikely family reunion for Bosch. A surprising revelation forces Harry back to square one on his case. The FBI approaches Eleanor with an enticing deal. George Irving faces severe jeopardy.

Deputy Chief Irving takes full measures in the wake of tragedy. Bosch finds himself in an unexpected alliance, which leads to a startling discovery. Eleanor seeks an advantage with the FBI. The nefarious gang behind serious crimes plans its exit strategy.

Bosch focuses on taking down a criminal mastermind. Eleanor delivers for the FBI. Opposing forces with violent intentions all converge on the same spot.

A leading suspect eludes Bosch's grasp. Deputy Chief Irving's world has unravelled, even as he's handed a once in a lifetime opportunity. Bosch and Edgar's pursuit of a dangerous ringleader leads to an epic showdown.

The season finale reaches an explosive climax. Bosch and Edgar discover the final piece of the Tony Allen investigation. Harry searches to uncover the truth behind his mother's murder.