Annika Boras

Gio returns and Betty tries to make amends, but he's not having it. Meanwhile, Daniel struggles with some shocking family news.

Casey makes a choice he later regrets at the scene of a car crash. Severide opens up old wounds as he investigates his findings in the lock-up.

Severide gets help from an unlikely source as he continues to search for the arsonist that killed Shay.

As the city is thrown into chaos by freezing temperatures, Sylvie gets trapped in a life or death situation. Plus, an abandoned baby is found at the Firehouse.

A man accused of murdering three Arabs claims that he is genetically predisposed to hatred and violence. Benson and Stabler break down his defence when they uncover the genuine stimuli to the slayings.