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

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…

Reese and Shaw pose as alumni at a high school reunion in order to keep eyes on the latest POI. Meanwhile, Finch and Fusco travel to Washington, D.C., to investigate…