Corey Brill

When a young officer is shot dead in the lobby of an apartment building, Intelligence looks to the latest known offenders who have threatened the police. But when a second officer is killed, the team finds that they are dealing with someone who is highly trained and knowledgeable. Voight (Jason Beghe) works to keep the case contained as they deal with Chicago's ever present war against the police. Meanwhile, Lindsay (Sophia Bush) confronts Antonio (Jon Seda) about his new job with the State's Attorney.

A nefarious virus is uploaded to Walter's computer, turning the team's new "smart" building project into a death trap with people locked inside.

Someone uses a laser light to blind a pilot and bring down a jet, which carries $1.2 billion in checks to be delivered to banks on the eastern seaboard.