A surprise visitor from Novak's past joins Ambo for a late-night ride-along.
Cruz's past comes back to haunt him. Severide prepares to teach an arson class at the academy. Mouch searches for a victim's next of kin.
Kidd and Severide eagerly await big news. Pascal searches for the perfect anniversary gift.
A new chief shakes things up at Firehouse 51. Violet and Novak work to uncover the truth behind a car crash.
After Damon disobeys Kidd's orders on a call, he turns to Severide to protect him.
