Books like The first rule by Robert Crais

Two young lovers, Tommy and Tuppence Beresford, form a private detective agency and are hired to locate a missing woman named Jane Finn, whose disappearance threatens post‑war Britain.

U.S. Marshals Teddy Daniels and Chuck Aule investigate a missing patient on Shutter Island’s Ashcliffe Hospital, only to confront sinister experiments and psychological horrors that threaten their sanity.

Detective Harry Bosch is drawn into a chilling series of ritual murders that threaten Los Angeles, forcing him to confront the city’s darkness and his own past.

Detective Harry Bosch has retired from the LAPD, but his half-brother, defense attorney Mickey Haller, needs his help. A woman has been brutally murdered in her bed and all evidence points to Haller's client, a former gang member turned family man. Though the murder rap seems ironclad, Mickey is sure it's a setup. Bosch doesn't want anything to do with crossing the aisle to work for the defense. He feels it will undo all the good he's done in his thirty years as a homicide cop. But Mickey promises to let the chips fall where they may. If Harry proves that his client did it, under the rules of discovery, they are obliged to turn over the evidence to the prosecution. Though it goes against all his instincts, Bosch reluctantly takes the case. The prosecution's file just has too many holes and he has to find out for himself: if Haller's client didn't do it, then who did? With the secret help of his former LAPD partner Lucy Soto, Harry starts digging. Soon his investigation leads him inside the police department, where he realizes that the killer he's been tracking has also been tracking him.

Elvis Cole, a Los Angeles private investigator, unravels a tangled web involving a missing husband and child, Hollywood crime, and drug trafficking.

When a Los Angeles jogger is shot, her rich Hispanic father hires disgraced ex‑police investigator Joe Pike, sparking a tense clash between Pike and a skeptical police force.

Bodyguard Joe Pike and private investigator Elvis Cole join forces to protect a federal witness and evade Los Angeles assassins, turning the tables on their deadly pursuers.

Elvis Cole, haunted by the mystery of his birth father, teams up with partner Joe Pike and LAPD detective Carol Starkey to trace a murdered man claiming to be his father, uncovering dark secrets and a merciless killer who targets the detective.

Nick and Nora Charles navigate a New York murder mystery with wit and charm, turning a hard‑boiled investigation into a sophisticated comedy of manners.

Mickey Haller, a cynical Los Angeles criminal defense lawyer, tackles a high‑paying case that turns out to be far more dangerous than it first appears.

A gripping tale of kidnapping and the relentless pursuit of justice, set in Los Angeles and involving private investigators and human trafficking.

Elvis Cole and Joe Pike, two Los Angeles private investigators, take on a high‑stakes case when a missing woman linked to a defense contractor is targeted by dangerous underground forces.

LAPD detective Hieronymous (aka Harry) Bosch is a loner and a nighthawk. Called out on a routine drug overdose case, Bosch soon realises that the victim found lying in the Mullholland Dam drainpipe is no accident case. Billy Meadows was a fellow 'tunnel rat' in Vietnam and Harry swears to bring the killer to justice.