So this is the reason Harry can’t make an appearance on Netflix’s show, and therefore the creators of The Lincoln Lawyer went on to introduce Mickey’s sister, who, as per my knowledge, has no real presence in Connelly’s novels. But you might be wondering, why did the writers introduce Mickey’s siblings all of a sudden? Well, the reasonable explanation behind it is that the next book in “The Lincoln Lawyer” series, titled “Resurrection Walk,” explores Harry and Mickey’s relationship in-depth, where the duo investigate a murder case involving a woman named Lucinda Sanz, 33, who was charged with first-degree murder for shooting her ex-husband, Roberto Sanz. As per the book, Roberto Sanz, 35, was part of a gang-suppression team assigned to the sheriff’s Antelope Valley substation, and had also been awarded the department’s medal of valor. In short, he was a celebrated cop, and the sheriff’s department went on a personal crusade to put Lucinda behind bars at all costs. Mickey finds out that Lucinda pleaded guilty to her ex-husband’s murder under pressure, and now she wants the Lincoln lawyer’s help to exonerate her and help her reunite with her son and her family.

So what I believe will happen in Netflix’s show is that Mickey’s sister will likely ask him to help Lucinda prove her innocence, the same as in the book. But you may ask, why would Mickey do that? Well, if you saw the closing sequence of the fourth season, then you are already aware of the fact that this mysterious woman, who calls herself Mickey Haller’s sibling, saved his life from a hitman sent by the Armenian mobsters, which means Mickey owes her a favor. Additionally, from the looks of it, it seems like Mickey’s sister works as a detective too, but definitely not for the LAPD, because if she was stationed in LA, she and Mickey would have definitely crossed paths earlier. Nevertheless, I won’t delve too much into theories here, as I believe that the next season of The Lincoln Lawyer will definitely shed light on Allison’s past, and where she has been all through these years. Furthermore, we will find out if it was Mickey’s father who had an affair with another woman, or if Allison is related to Mickey’s mother, Elena Haller. Additionally, it could be possible that Allison is not biologically related to Mickey at all. Remember how in season 4, episode 1, Elena told Mickey on call that she was getting married to her new agent, Rick? So it could be possible that Allison is Rick’s daughter, which makes her Mickey’s sister, right? I mean, you heard the words. Allison introduced herself as “the sister.” She didn’t mention how she’s related to Mickey, so the writers intentionally withheld the information here until they can flesh out Allison’s character further. Nonetheless, if Allison is Ricky’s daughter, then it’s likely that she’s from Mexico, where Mickey’s mother works as an actress.

And lastly, the introduction of Mickey’s sister is extremely crucial to the plot of Season 5, as it sets up the heartbreaking cliffhanger, paving the path for Season 6 if the show gets renewed again. I won’t give away too many spoilers here, but just for your information, at the end of the book, we find out something really shocking about Harry’s character, suggesting Mickey may have to deal with a personal tragedy in the days to come. However, this sad news will hit harder if this sister turns out to be biologically related to him, as Mickey will regret not having met her before. But let’s keep that discussion for the next season. So these are my theories on the mysterious character that appears in the Season 4 finale, but if you have anything to share about Mickey’s sister, please feel free to drop your comments below.