The villagers face the truth about their past and get rid of their demons when Gamash achieves a breakthrough and realizes that Mark's killer had a personal motive.

Noah prepares a Christmas surprise for Liv, And she's shaking her life. Carisi and Monsey are scheduled for trial, And Rollins makes a fateful decision about her career.

After Benson falls victim to a brutal attack, Captain Duarte takes over the investigation file. The unit joins the special section of the Bronx, To assist in the investigation of the rape of deaf students.

To get Joel out of the Hands of the Russians, Cullen and the team use bait. Cullen reveals who accused him of spying for Russia.

Stella Kidd needs to prove herself at a national leadership seminar for firefighters, While the rest of the station handles a string of suspicious accidents. Mauch is trying to set up an internal newspaper at the station to keep everyone up to date. Cruz faces heartbreak.

Firefighters raise suspicions of malice in residential fire. The women open a women-only lounge at the station, But the results are disappointing.

A sensational discovery in Vilna makes Lexi face reality.

Pat joins the investigation, Joe and Tasha discover an unexpected side of Daniel's life, And Jo comes close to discovering the killer.

The villagers face the truth about their past and get rid of their demons when Gamash achieves a breakthrough and realizes that Mark's killer had a personal motive.