Caitlin Carver

Leslie tries to complete some of her biggest city council goals, like hosting an NFL Play 60 event with the Indianapolis Colts, and trying to add fluoride to Pawnee's drinking water.

Leslie fights with Ben over questionable sales techniques at the local farmers market.

The big wedding day arrives and Firehouse 51 welcomes Casey back to celebrate the joyous occasion; Emma's plans to replace Violet come to a shocking end.

Mouch and Ritter work together to solve a murder mystery; Severide and Cruz tackle a food truck fire; Gallo goes to see Hawkins about Violet.

A family friend asks Herrmann for some advice on opening a bar; tensions run high between Emma and Violet; Kidd struggles to keep her team together.

Firehouse 51 must band together when one of their own is taken hostage.