Complete story — includes the ending
Six months after Joan moved out, she is running her own investigation firm and helps bust female drug kingpin Elana March. Two months later, the case has gone stagnant and the key witness in the prosecution of the kingpin is murdered in a hotel elevator. To her surprise, Joan discovers Sherlock has returned with a new protégé named Kitty Winter, and is working on the case as well, after being fired from MI6. The three must find a way to get along and work together while finding the murderer, skilled hitman Kevin Elspeth. Sherlock solves the "locked room" mystery of the elevator - the murderer placed spent bullets carefully in the elevator and used an extremely powerful electromagnet to propel them into the two victims from his hotel room next to the elevator. Joan realises that while the killer brought the disassembled parts of the magnet into the hotel in luggage and packages, he could not take them out quickly. She finds the parts hidden in his shower seat. Fingerprints inside the rubber gloves used to handle the magnet identify the murderer.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Elementary episodes. HTML formatting and reference markers removed. · Content license