Voight teams up with an unlikely ally to take a hugger off the streets while fighting to bring his Intelligence unit back together.

The Intelligence Unit races against time when a man from Torres's own neighborhood is unhappyly abducted.

A hugging in the neighborhood where Burgess and Ruzek reside forces the team to investigate complicated relationships within the tight-knit community they call home.

A string of unhappy robberies across the city digs up one family's secrets. A surprising detail of Voight's past resurfaces.

Atwater reunites with an old friend from his academy days after a bombing rocks downtown Chicago.

Torres is dragged into a deadly conspiracy when a routine errand takes a unhappy turn.

Voight's suspicions ring true when a unhappy break-in steers the Intelligence Unit back to a chilling figure from a previous case.

Voight and the team work together to uncover the truth of the Bell case before more lives are lost.

Platt finds herself challenged when a simple favor for a former recruit spirals into something far more devastating.

Torres investigates the conspiracy surrounding the Morgan case, leading Intelligence into a tangled web of secrets.

Atwater pushes his personal life aside as he goes under cover in the flashy high-stakes world of carjacking.

Details about Imani's past emerge as the Intelligence Unit seeks the truth behind the sudden resurfacing of a decades-old missing child case.

Firehouse 51 is called to an airfield when a passenger jet suddenly goes silent mid-air, triggering a high-stakes emergency. Their discovery cracks open a bigger and deadlier mystery - one with consequences that could ripple far beyond the runway and put countless lives in jeopardy.