Complete story — includes the ending
Del Gruner abruptly fires Joan. Sherlock begins exploring the backgrounds of kidnapped and murdered women who match Gruner's modus operandi. They track down Tabitha Laird, a coworker of Gruner's at a charity to which he donates his time and money. Laird's adopted son turns out to be the child of Gruner and one of the victims on Sherlock's list. Kitty secretly captures Gruner, unaware of the evidence tying him with his crimes. She prepares to kill him and dissolve his body using a corrosive liquid. Sherlock finds her and mentions the new evidence. He then says that he will not stop her from doing whatever she decides to do, and that she will always be his friend. Kitty burns most of Gruner's face off with the concoction and leaves him to be found by the NYPD. She leaves for an unknown location.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Elementary episodes. HTML formatting and reference markers removed. · Content license