Jacqueline Williams

Detective Lindsay calls in suspects in the disappearance of Katie's kidnapper; Jones struggles to fit in; Herrmann celebrates his 20th wedding anniversary.

Boden tries to keep the firehouse from closing; the romance between Dawson and Casey grows; Cruz worries about his brother's safety; Severide and Katie make up for lost time.

House 51 comes under investigation for negligence after Interim Chief Pridgen makes a grave tactical error during an apartment fire.

During a shooting case, Burgess and Atwater discover that the only witness is Olinsky's daughter. Later, Ruzek reaches out to Burgess for assistance on an undercover mission.

Casey reunites with a former colleague; Dawson and Brett serve their time in retraining; Severide tries to fix what's going on with Anna.

With Lincoln's execution just minutes away, the team make a break for it.