Complete story — includes the ending
An illegal high roller poker game is robbed, the look-out murdered, the dealer Sofia Darrow injured, and the organizer of the game, Lin Wen, comes to Sherlock and Joan for help after being framed for it all. Lin claims she knew Mycroft well, getting her off on the wrong foot with Joan, but Sherlock takes the case. Interviewing the players leads to footage of the game, from which Sherlock deduces Darrow and the thieves staged it all. NSA Agent McNally intervenes. Darrow, aka Szofi Demir, is a spy who staged the robbery to secretly copy (steal) a key belonging to poker player Mateo Pena. The copied key allows access to a secure computer server room at Semper Apex, Pena's firm, that hosts U.N. diplomatic communications. Joan confronts Lin with the truth that they are half-sisters.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Elementary episodes. HTML formatting and reference markers removed. · Content license