Stephen Tyrone Williams

When a hedge fund manager who was also running a Ponzi scheme is murdered, Holmes and Watson must determine which of his clients is guilty. Also, Sherlock contemplates sponsoring a fellow recovering addict.

When Joan revisits one of Sherlock's cold cases, she discovers an unsolved murder is connected to a rare prehistoric fossil. Meanwhile, Sherlock finds himself in uncharted territory when his duties as a sobriety sponsor cross his personal boundaries.

When Shaw is tasked to stay close to a 10-year-old (guest star Danielle Kotch) identified by The Machine, she grudgingly develops respect for the young girl’s skills in surveillance and realizes it could be the very reason why the girl’s number has come up. Meanwhile, Carter’s mission to bring the criminal organization HR to justice risks exposure.