After a doctor is found dead at a golf course, the CBI team searches for a killer amongst a hospital's staff and patients. Meanwhile, when LaRoche is placed in charge of the CBI, his first act of business is to name Cho the new team leader.

Alec’s foray into the field of science-based forecasting takes an unexpected turn when a forecaster’s statistical model predicts a train disaster. With time running out, Alec must take drastic measures to avert a mass casualty catastrophe.

After a doctor is found dead at a golf course, the CBI team searches for a killer amongst a hospital's staff and patients. Meanwhile, when LaRoche is placed in charge of the CBI, his first act of business is to name Cho the new team leader.

Alec’s foray into the field of science-based forecasting takes an unexpected turn when a forecaster’s statistical model predicts a train disaster. With time running out, Alec must take drastic measures to avert a mass casualty catastrophe.

After a doctor is found dead at a golf course, the CBI team searches for a killer amongst a hospital's staff and patients. Meanwhile, when LaRoche is placed in charge of the CBI, his first act of business is to name Cho the new team leader.

An alleged rapist is violently murdered.

Rusty tries to decide how to share a secret with the squad.

Alec enters the world of K-Pop fandom when a superfan is murdered, and the only suspect is the pop star the fan idolizes. Alec and Rose dig beneath the surface to uncover what happened and, in the process, he uncovers more about her past.

As the team chases a deadly bomber who's terrorising Manhattan, Jane uncovers a shattering secret from her youth.

Severide investigates a suspicious high school fire. Novak gets an unexpected call. Violet brings a 51 firefighter onboard the ambulance for a shift.