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Robin Williams guest stars as engineer Merritt Rook, who poses as a police officer on the phone to trick people into committing criminal acts. Rook's clever self-defense at trial sets him free, leading to publicity and followers stemming from his anti auth (more…)
Additional clues about Shay's death emerge. Meanwhile, Severide faces an old foe; Shay's sister arrives, inspiring the firehouse members to reflect on her life; Otis' grandmother relocates; and Boden sets out to help his dying father (Richard Roundtree).