When a reality show contestant is murdered, Holmes and Watson zero in on another competitor as a suspect, a former war criminal who may be the most skilled killer they've ever pursued. Also, for the first time since he attacked Sherlock, Shinwell reaches out to Joan to ask for a favor.

Holmes and Watson pursue an elusive criminal as a gang war erupts in New York City. While the NYPD works to contain the violence, the two investigate the murder that appears to have ignited the city-wide conflict, and discover that a familiar face is pulling the strings.