Larisa Polonsky

When a school nurse notices several injuries on a young girl, the team investigates. A look at the family reveals a mother struggling to manage the violent outbursts of her nine year old son. As the SVU squad and the visiting Doctor debate an appropriate course of treatment, the situation rapidly explodes into a dangerous standoff.

Lt Severide is targeted by an arsonist, Battalion Chief Boden clashes with Gail McLeod the anniversary of Andy's death, Shay has suspicions, and Mari visits Mouch.

Severide is on edge after the arson attack, fearing what might be in store next. Shay and Dawson, meanwhile, plan to party away their problems.

Severide tries to prove his suspicions about the arsonist's identity, Casey gets accustomed to his new lifestyle, and Dawson goes on a date with a regular from the bar.

Lt Casey must work with Voight and the Intelligence Unit, Shay grows increasingly excited about the prospect of motherhood, and everyone comes together to support the opening of Molly's.

Severide wants to implicate the serial arsonist, Dawson and Shay face the unexpected on a routine call, suspicions indicate Clarke is the mole, and Mouch campaigns for union president.