Sandy Rosenberg

A man takes hostages, including Joan, and threatens to execute them unless Holmes finds the person responsible for the death of his son. As Sherlock investigates, the captor gives him 16 hours to find the perpetrator before the statute of limitations on the crime runs out.

Reese and Shaw infiltrate their most dangerous location yet – a high school reunion, posing as alumnae in order to keep eyes on the latest POI, Matthew Reed (guest star Nestor Carbonell). Meanwhile, Finch and Fusco travel to Washington D.C. to investigate the motivations behind Vigilance’s latest attack.

Liza worries about her daughter's online activities, Kelsey's relationship with Jake crosses a professional boundary, and Josh contemplates a long-term decision.