Gene Weygandt

Severide tries to help a firefighter from Denver struggling with addiction; Shay and Dawson plan a girls weekend at a cabin in the woods; Mills and the guys update Mouch's online dating profile.

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

The fate of the hospital rests on the vote of an incapacitated board member; Archer helps a mother with a rare stem cell disease while Asher treats the woman's pregnant daughter; Charles meets a patient with schizophrenia and a hearing impairment.

Dawson is rattled by a suicide note she receives in the mail; Casey contemplates a life-changing purchase; Severide looks into Bloom's dark past.

Severide must leave Lindsay and the Intelligence Unit to find Katie; Casey gets more information about his head injuries; Dawson works to pass the physical test.

Dawson and Casey's relationship is further strained when Dawson breaks protocol during a call-out to a dangerous chemical spill.