Leslie and Ben argue over sales techniques at the farmers market. Ann looks for a way to let off steam about the annoying parts of pregnancy. April backs Andy in a new creative venture.
Leslie tries to tackle some of her goals, such as hosting an event with the Indianapolis Colts and adding fluoride to Pawnee's drinking water. Chris and Ron build a crib for Ron's upcoming child.
Det. Pryma's case comes to an explosive end with Kidd and Carver's lives in danger; Brett installs an infant safe surrender box at 51; Violet is determined to take Emma down.
Severide struggles with the cost of helping Det. Pryma with the Martucci case; Gallo campaigns for Herrmann to represent 51 at the National Firefighter's Association's Winter Conference; a familiar face makes a shocking return.
Firehouse 51 prepares for their semi-annual firehouse inspection; Brett fights to save her paramedicine programme; Commander Martin Pearce asks Severide for a favour.