A family of victims from a house fire is rushed to Gaffney. Lenox fights to save two sisters injured in an all-night rave turned tragedy. Tensions mount between Goodwin and Abrams over difficult staffing changes.

Things get personal when Ripley and Archer butt heads over an unusual case. Asher makes a surprising discovery with an expectant couple. A patient throws the hospital into chaos.

Lenox and Frost receive an unusual request from the parents of a patient on life support. Ripley and Charles work with a man who can't remember who he is.

Charles races to convince a patient to accept treatment before it's too late. Frost bonds with a young girl battling immunodeficiency. Lenox makes a chilling discovery.

A personal clash between Asher and Archer reaches a breaking point. Charles and Ripley uncover a rare neurological disorder in a patient. Goodwin's personal life is put to the test.

Secrets are uncovered when Goodwin's family comes together for Bert. Ripley and Frost treat two children stung by hornets in a treehouse. A member of the team struggles with relationship woes.

Charles grows increasingly suspicious of a colleague's intentions. Lenox crosses a line to protect a patient. Asher and Archer treat a soon-to-be father battling cancer.

The doctors deal with the professional and personal fallout from the choices made during a city-wide power outage.

Tensions spike when a road rage incident sends three patients into the ED. Frost's former television co-star resurfaces. An unexpected arrival catches Asher and Archer off guard.

Archer and Frost confront a troubling medical mystery while treating a college basketball player. Lenox's treatment of a surrogate patient leads to unexpected complications for the patient and her best friend.

Old resentment stirs up Charles when his best friends from med school visit. Asher is forced to overcome obstacles in the treatment of one of her patients. Ripley looks to honor his best friend, Sully, on the one-year anniversary of his death.

Charles faces a new challenge when three medical students shadow him for a day. Goodwin faces a high-stakes board meeting. Frost reckons with his past.

The doctors at Gaffney are thrust into a race against time as they work to unravel a baffling medical mystery linked to the passenger jet, while lives hang in the balance. The crossover begins on Chicago Fire S14E13 Reckoning (I). It continues on Chicago P.D. S13E13 Reckoning (III).

Archer and Lenox treat two friends who were injured in St. Patrick's Day festivities. Hannah and Ripley treat a woman in the middle of a messy divorce.

Archer confronts his own mortality while on a complex case. One patient's quirky habit baffles Charles and Theo. A fatal diagnosis shocks one of the doctors at Gaffney.

Dr. Charles grapples with his own mental health after working the suicide prevention line.

The doctors at Gaffney work to save one of their own in critical danger; Hannah finds herself at odds with the ob-gyn who will fill in for her maternity leave.