Sylvie witnesses a murder and is threatened by the shooter not to go to the police. Firehouse 51 jumps into action when a fire breaks out at a restaurant and traps several people inside a vault. Mouch starts to get cold feet.
Down In the Blackness — Patrick Park
Mouch arrives at the bar and tells Hermann and Kelly that the wedding is off, upon questioning him he tells the two why he's not ready but Hermann manages to talk him down.
Mouch and Trudy wedding dance; as they watch Mouch and Trudy dance, Casey brings up marriage to Dawson, she tells him she like the way things are in their relationship currently.
Stella tells her and Kelly's wedding table the story of Kelly's unrequited love for her including how he broke into her apartment and how she had to stop her husband from calling the police.