Mysterious deaths and disappearances ramp up in the city. A doctor makes a frightening discovery, and a local reporter becomes tomorrow's headline.

Gino grapples with his trauma. Patrick's search takes him to dark places. A stranger contacts Hannah with a grave warning.

Firehouse 51 hosts a Halloween open house. Kidd and Severide help a young girl after she gets kicked out of her home.

After Beth makes a major discovery on The Gambler's laptop, the team moves forward with a risky plan that effects the entire town of Blue Valley.

June and Serena find themselves in a desperate situation.