Kaley Ronayne

When New York City experiences a major blackout, cops scramble to contain the resulting chaos, and Frank uncovers some unpleasant truths about his department in the aftermath. Also, Jamie and Eddie question the line between work and their relationship, and Danny and Baez race to question the subject of a murder investigation before she gets tipped off by her ex-boyfriend.

The death of Judge Tommy Wells' (guest star John Pankow) daughter puts Intelligence on the track of a pill mill spreading into the suburbs of Chicago and the doctor enabling it. Meanwhile, Voight (Jason Beghe) discovers who's been leaking information from the 21st.

McCall is hired by an online group of true-crime enthusiasts to find the anonymous stalker of an unsuspecting NYC woman when the criminal claims he will murder her in eight hours.

After a petty officer is found murdered on a golf course, McGee spends hours on the victim's ham radio trying to locate a key witness. Also, Palmer asks his co-workers to donate to a charity that builds playgrounds for kids of all abilities, and Torres surprises them with his generosity.

A case turns personal for Conrad when the donor recipient of Nic's heart is admitted to the emergency room; Bell is faced with a devastating diagnosis that causes him to make a heartbreaking decision.