-Heroin laced with anthrax puts Joelle and her ex-lover/dealer Nathan. 15 Division tries to track down the source.
-Andy and Marlo stumble across part of the stash and are exposed. While they wait for hazmat Andy finds out that Marlo has been hiding that she's bi-polar not only on the job but from Sam. Andy agrees to keep her secret.
-After bi-polar medication is found at the precinct, Dov suspects it's Chloe's and breaks off their date for that night. When he confronts her she is furious, tells him he's wrong and storms off.
-Gail starts to see the signs of Nick's affection for Andy. Later she finds out that Nick could have come home on some weekends why he was undercover but chose not to.
-It's Chris' last shift before his transfer but he chooses to tell no one and leave quietly.