Who helped save Mouch's neighbor?
All eyes were on the mysterious hero on Chicago Fire Season 9 Episode 12 after an impressive save.
Fortunately, there was a lead in the case, but there was also a major caveat.
Meanwhile, Boden lead another group of firefighters to save a group of civilians from a fire that could have been prevented.
Elsewhere, Casey checked in with Severide.
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.