What did Rene Royce want?
That was revealed on Chicago Fire Season 6 Episode 21 as Severide was shocked to the core by her arrival at the firehouse.
Meanwhile, Casey came up with a plan to help Boden in his latest pursuit of a suspect.
Also, Kidd regretted what happened between her and Severide, but did the addition of Rene complicate matters?
Finally, Herrmann and Colannino went to war of their son's basketball team.
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.