On Tonight

The search for a police officer's runaway daughter leads the detectives through an underground rave culture that caters to wayward teens.

The team investigates a male escort service that may be killing it's own staff.

Halloween is in full effect for Foster and Brett, who are summoned to a home where a prank has quickly turned serious.

Kidd and the team embark on a mission to help Severide.

A successful businesswoman and mother of three is found shot in her office; the investigation into her death leaves a family divided.

Two decades after a Jacksonville, Fla., woman goes missing, her son solves the mystery that haunted his childhood.

A 21-year-old college senior is shot and killed in a public park just months before her graduation.

Voight's "stay out of politics" stance is challenged as Intelligence uncovers the details surrounding a prolific serial killer.

A mayoral candidate is shot by an unidentified sniper.

Voight and Ray Price organize a peace summit.