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.
An infant's doctor is suspiciously murdered while J.C. and Eddie are investigating a baby's emergency room death.
When Sipowicz's estranged son, Andy Jr., shows up and announces his engagement, Andy Sr. decides to look into the bride-to-be's background. "Lou the Werewolf" shows up at the stationhouse begging to be locked up before the next full moon.
A couple visiting their daughter in Bushwick embraces their urban surroundings while dealing with a less-than-ideal rental that comes with an unwelcome roommate. The Guy delivers to Brenna and Molly's all-female, politically-minded meetup, where things get dramatic fast.
Detectives Briscoe (Jerry Orbach) and Curtis (Benjamin Bratt) team up with Baltimore Detectives Pembleton (Andre Braugher) and Bayliss (Kyle Secor) to help catch a man accused of setting gas bombs in New York and Baltimore. However, the NY detectives quickly discover that their methods of investigation strongly conflict with those of the Baltimore guys.