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On Chicago Fire Season 4 Episode 18, Sylvie witnessed a murder and, as a result, was threatened by the shooter not to go to the police.

Did she give in to these threats? Where did the storyline go in the end?

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Watch Chicago Fire Season 4 Episode 18 Online

Elsewhere during an intense hour, Firehouse 51 leaped into action when a fire actually broke out at a restaurant and trapped numerous people inside a vault. Uh-oh.

Finally, Mouch started to get cold feet about what was on tap.

Click on the video above to watch Chicago Fire online and to see how all of these big events transpired.