51 joins forces with Hank Voight and the police department when they discover that the fire was intentionally set.

Season 5 Episode 15 "Deathtrap"
51 responds to an out of control warehouse fire with dozens of victims inside. The team races against time to try and save them all. One of the victims is Alvin Olinsky's (guest star Elias Koteas) daughter Lexi who was found in critical condition. Later on, 51 joins forces with Hank Voight (guest star Jason Beghe) and the police department when they discover that the fire was intentionally set. Also, Severide tries to get in contact with Anna.

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