You can watch "Chicago Fire Season 7 Episode 21" for free from The123Movie.cc on this page by streaming the episode in the video player above. This episode belongs to "Chicago Fire" tv-series. you can also watch the other episodes of this season by clicking Next or Previous button under the player. A serial arsonist cold case is reopened when Lt. Severide finds a connection to a recent salon fire. Firehouse 51 celebrates a retirement party.