Complete story — includes the ending
Sherlock is reunited with British serial killer "M" who appears to have followed him to New York; Joan eventually learns that "M" is the one who murdered Sherlock's lover Irene Adler, causing him to spiral into his previous drug addiction. However, after Sherlock captures "M" and privately interrogates him, he learns that "M" (whose name is Sebastian Moran ) is not a serial killer, but an assassin, and that he was in prison when Irene was murdered. Moran is on the payroll of a mysterious criminal named Moriarty, who heads a shadowy criminal organization; Moriarty killed Irene and pinned the blame on Moran. Sherlock vows that he will hunt down Moriarty. Meanwhile, Joan has reservations about leaving Sherlock.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Elementary episodes. HTML formatting and reference markers removed. · Content license