Lisseth Chavez

While the entire Boston Police Department searches for Alice Sands, the team investigates a car crash that isn't all it seems. Plus, a new romance blossoms.

After zeroing in on a suspect responsible for bioterrorism, the P.D. prepares to undertake its biggest manhunt yet; Upton is torn between helping track down the perp and providing emotional support to a scared young girl who needs her.

An entire apartment complex is forced into quarantine when cases of a deadly virus turn into an epidemic; P.D. chases a lead that could point to a case of bioterrorism, and Will gets dangerously close to the suspect.

After a botched carjacking turns out to be something much bigger, Voight's unit goes toe-to-toe with a smart drug kingpin who only works with women; new recruit Vanessa Rojas struggles with the transition from under cover to intelligence.

Halstead's secret ongoing relationship with a woman connected to another case puts him in jeopardy.

A murder in a Bulgarian neighborhood results in a challenging investigation when locals won't talk to police; Ruzek has a clash with a patrol officer.