Did Casey and Severide get to the root cause of a fire in a house?
That was a key question on Chicago Fire Season 5 Episode 5 when Casey failed to save a woman in a house fire.
Meanwhile on this hit drama series, Herrmann decided it was time to get revenge on the mystery tagger, so he set out to find them, but who was it?
Use the video above to watch Chicago Fire online to get caught up with the latest developments for the people who work in Firehouse 51.
Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.