[This article contains spoilers from season 4].
Last season proved a huge one for tough-as-nails Detective Hieronymus “Harry” Bosch (Titus Welliver).
He finally nailed the real killer of his mother, led perhaps the biggest case of his career and suffered a crushing personal blow. And by the end of the action-packed season 4 finale of the gritty LA-set cop drama, based on the best-selling novels by Michael Connelly, three major murders had been solved.
Here are the key things you need to know before watching season 5, which premiers on July 25.
Bosch cracked the Angels Flight murder case…

Bosch investigated the murder of attorney Howard Elias (Clark Johnson) on the Angels Flight funicular. Source: SBS
Elias was due to prosecute the so-called Black Guardian case against the LAPD, in which his client, also African American, accused detectives of shocking brutality during an interrogation. The attorney had already made many enemies in the LAPD by ending several careers of crooked cops, so suspicion quickly fell within Bosch’s department.
With the City of Angels on edge at the seemingly racially motivated murder and violence at the hands of the police, Harry was under pressure to find the killer. His investigation unveiled a web of corruption leading straight to City Hall and the upper echelons of the LAPD.
In one of the season’s biggest twists, the killer turned out to be none other than the very dirty Police Commission President, Bradley Walker (John Getz, Blood Simple).
…and finally caught his mother’s killer at the same time

Bosch arrested Police Commission President Bradley Walker for murder. Source: SBS
In a showdown in a network of underground tunnels, Walker admitted to the crime, goading Bosch to kill him. But the detective resisted – jail for a top cop would be a much worse fate.
Bosch’s ex-wife Eleanor was murdered

Bosch attempted to save his gunned down ex-wife Eleanor (Sarah Clarke). Source: SBS
But tragedy struck when Eleanor was gunned down by two assassins on a motorbike in a café car park moments after a heart-to-heart with Bosch over coffee. In a heartbreaking scene, he desperately tried to revive her to no avail.
In the final moving moments of the season, Bosch stood beside Maddie as she released Eleanor’s ashes into a canyon.
Eleanor’s shooter was killed but the man who hired him got away

The body of Eleanor’s killer furnished with his business card. Source: SBS
It transpired that not only was Chen responsible for laundering money from the gambling operation for a planned act of “financial” terrorism against the US, but also orchestrated Eleanor’s assassination. But to Harry’s dismay, the FBI let him get away on a private plane back to China, to avoid an international incident. The FBI’s rationale was that the punishment meted out by his criminal bosses for exposing the gambling racket would be far worse for Chen than jail. But it’s of little comfort to Bosch and Maddie.
The Koreatown Killer case was solved

Detectives “Crate and Barrel” (Gregory Scott Cummins, Troy Evans) flanked by Lt. Grace Billets (Amy Aquino) at the scene of the hit-and-run. Source: SBS
Coming up in season 5

Bosch in disguise as he infiltrates a drug ring in season 5. Source: SBS
question. And sparks are bound to fly with the attorney representing Bosch none other than his sometime nemesis Honey Chandler (frequent Bosch guest star Mimi Rogers, Lost in Space).
Bosch won’t be retiring any time soon with the show already renewed for season 6, but the question is, what shape will he be in at the end of this season?
Now you're all caught up, dive into Season 5 at SBS On Demand: