Harry Bosch's Evolution: Seven Key Changes Over 34 Years Harry Bosch has evolved over 34 years and 25 books. Explore the seven biggest changes in Michael Connelly's detective, from LAPD to defense investigator. Since Michael Connelly's Bosch book series debuted 34 years ago, Harry Bosch has continued to grow as a character, and these are the seven biggest changes. The titular detective was the first lead introduced by Connelly, and he remains one of the author's most popular characters over three decades later. The devotion to Harry Bosch makes sense, looking at the books and TV shows. Harry Bosch Series and Its ExpansionsThe Bosch book series has 25 books as of the time of writing, with The Hollow, the 26th book, releasing on October 27, 2026. In comparison, the next-biggest series, The Lincoln Lawyer, has only seven books. Similarly, Prime Video's Bosch TV franchise has three series, with a prequel titled Bosch: Start of Watch coming to MGM+.Connelly's books have a unique way of looking at time. The events of his books occur in real time, not in a separate timeline. This means that Harry Bosch has aged roughly 34 years since The Black Echo was released. As with any real person, Bosch has continued to develop with every new experience and relationship. He is still fundamentally the same person in terms of his core values and baseline traits, but other parts of his personality and life have changed. These are the seven most notable examples.Closure on His Mother's MurderWhen Harry Bosch starts out in The Black Echo, it's pretty clear that the weight of his mother's unsolved murder, alongside his experience as a Vietnam vet, influences who he is as a person. The traumas are constantly there. However, in the 1995 book The Last Coyote, the detective finally gets the closure he so desperately needs by solving the case. He tackles this while on an involuntary suspension from the LAPD.Bosch finds the true identity of his mother's killer, which heals an open wound he has carried his whole life. He now knows the killer. Unfortunately, to solve the case, he has to uncover immense police corruption, eroding Harry Bosch's trust in the police system that he exists within. His mother's death solidifies his position that Everybody counts, or nobody counts.From Impulsive to ContemplativeEarly in the Bosch book series, the character is a bit brash and impulsive. He often acts before he thinks until the last few books. He attacks Harvey Pounds in The Last Coyote. He shoots The Dollmaker in The Concrete Blonde. He rushes into Hong Kong to get his daughter back from the Chinese Triad in 9 Dragons.In more recent years, he's become more thoughtful and contemplative when investigating cases. In the 2022 novel Desert Star, he steps back so that he won't ruin the case. As his health starts to falter, he has to plan multiple steps ahead before taking any action because he no longer has the physical abilities he used to. This seeps into his appearances in The Lincoln Lawyer books as well, where he's the brains behind Mickey Haller's cases.Working with the DefenseAt the start of the Bosch book series, the titular detective distrusts attorneys and shows deep hostility toward them. This stems from a good-intentioned place, even if it's somewhat misguided. His absolute morality leads him to believe that defense attorneys undermine the hard work of detectives and prosecutors by putting the defendant above the victim. He thinks they only look for loopholes and manipulate the legal system. There's no way that Book 1 Harry Bosch would work with the defense.Harry Bosch has a supporting role in four The Lincoln Lawyer books, and Mickey Haller has a supporting role in seven Bosch novels, including The Hollow. However, he begins helping his half-brother Mickey Haller with some of his cases and, in more recent The Lincoln Lawyer books, eventually takes on a job as an investigator for the defense. He still has extremely strict limits and rules, though.Bosch won't select a new client for Mickey unless he's confident they are not guilty. What's more, if he finds evidence that an individual is guilty, Mickey agrees to turn it in to the prosecution, per the rules of discovery. Unfortunately, Harry and Mickey can never appear onscreen together because different streamers own the rights to the Bosch series and The Lincoln Lawyer books.Departure from the LAPDHarry Bosch starts the book series as a detective with the Los Angeles Police Department, a job which he continues until the end of the 2002 novel City of Bones. The detective grows increasingly frustrated with the department's inane bureaucracy, so he retires and starts working as a private investigator in Lost Light.He returns to the LAPD in 2005 as part of the retired officers re-entry program, working on the Open-Solved Unit. Eventually, he goes back to the homicide division. The detective once again retires in the 2015 book The Crossing because he hits the mandatory retirement age. At this point, he volunteers at the San Fernando Police Department and occasionally helps out with Mickey Haller's cases.