Elementary season 3, episode 11 puts focus on Kitty Winter’s origins. Find out everything you need to know about “The Illustrious Client.”

At the close of last week’s Elementary, Sherlock was a mere moment away from presenting Kitty with the same offer he gave Joan over two years ago. Before he could ask Miss Winter to make the transition from protege to partner, however, Captain Gregson called with some disturbing news. A body was found with the same markings that Kitty received from her captor in London.

Elementary returns this week with Kitty at the center of a two-part episode. The title of the first episode, “The Illustrious Client,” calls back to the story of the same name written by Sir Arthur Conan Doyle. Part of The Casebook of Sherlock Holmes, “The Illustrious Client,” is the only story to mention Kitty Winter and offers a brief context of her background with her captor.

Related: Getting to know Kitty Winter

The CBS drama has already taken some liberties with the source material and made the villain in the tale equally, if not more, sinister than his predecessor. We’ve compiled a list of key moments from “The Illustrious Client” that we believe are important to keep in mind when watching this week’s Elementary season 3, episode 11.

The antagonist

Doyle’s story may sound familiar to fans of the BBC Sherlock series. Some of the lines, the mysterious client, and even the bed sheet, all originate in “The Illustrious Client,” and make an appearance in the episode “A Scandal in Belgravia.” But for our purposes, the villain of this tale is taken on solely by Elementary. His name is Baron Gruner, an Austrian murderer who preys on women and keeps records of his dealings with them. The sex, torture, and even murder are all logged in his brown leather book.

Gruner is described in the story as, “cool as ice, silky voiced and soothing as one of your fashionable consultants, and poisonous as a cobra. He has a breeding in him-a real aristocrat of crime with a superficial suggestion of afternoon tea and all the cruelty of the grave behind it.” His ability to lure women then trap and torture them is enough to make anyone’s skin crawl.

Kitty’s vengeance

There is no doubt that by now fans of Elementary have a taste for Kitty’s personality. She is sharp, her words can cut like a knife, but she is also recovering. There are a great many dimensions to her, and while she has been less eager to take out Watson with her baton, we have seen her erupt a few times. (Recall the time she “took care of” Captain Gregson’s problem with his daughter’s partner.)

The Kitty Winter in “The Illustrious Client” by Doyle is not so different. Although she does not have the benefit of two extremely important friendships, she does have a tendency to flare up at the mention of crimes similar to her own experience. When she is called into the case, she is quoted saying, “Oh, if only I could pull him into the pit where he has put so many!” If you close your eyes you can almost imagine Ophelia Lovibond with her eyes shooting daggers saying that exact line!

Sherlock and Kitty’s shared passion

Try to think all the way back to season 1. Sherlock and Joan are nearing the end of their training and just before she is about to leave, Sherlock catches wind that the man who murdered Irene has made his way to New York. Using the clarity of his sobriety exercises, Sherlock sees what needs to be done to the man who caused him so much pain. Torture, suffering, and ultimately murder all make his list.

Will Kitty feel the same way? All signs seem to point to yes if you take the ending that Gruner meets in “The Illustrious Client” to heart. Sure, most stories based on canon tend to veer off, but let’s stick to what happens in canon!

Watson talks his way into Gruner’s study with his recent readings of Chinese pottery, while Sherlock sneaks into the house to steal Gruner’s book of secrets. But when the plan goes awry, Kitty steps in and tosses vitriol upon Gruner’s face. The story is quite detailed about what the corrosive oil does to the man, so we’ll spare you the specifics.

The only downfall to this story is that Kitty is arrested after Gruner calls out her name repeatedly while his face melts away. Although she receives minimal punishment considering the circumstances, we cannot expect the NYPD to look the other way should this type of event take place.

What does all of this mean for Elementary‘s Kitty Winter? We’ll have to wait to find out!

Watch Elementary season 3, episode 11, “The Illustrious Client,” Thursday, January 22 at 10:00 p.m. ET on CBS.