The seventh and final season of Elementary (2019) serves as a concise, 13-episode "swan song" that brings the modern-day partnership of Sherlock Holmes and Joan Watson to a definitive close. Following a cliffhanger at the end of Season 6, the final run begins with the duo established as consultants for Scotland Yard in London before a personal crisis draws them back to New York City to face their most technologically advanced adversary yet.
The season is defined by a central struggle against (James Frain), a tech billionaire who has developed a predictive algorithm designed to stop crimes before they happen. This storyline forces Holmes and Watson to grapple with the ethics of vigilante justice and preemptive punishment. Elementary Season 7 Episodes - TV Guide