Watch Chicago PD Online: Season 4 Episode 18

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Why did Nicole hate Ruzek?

That was a key question on Chicago PD Season 4 Episode 18 when Burgess's sister arrived in town for a visit and quickly caused a stir. 

Did Burgess manage to calm things down?

Meanwhile, someone was murdered over a piece of mysterious footage, prompting the team to uncover details that painted one of Chicago's wealthiest families in a bad light. 

Were they really as evil as they were made out to be?

Use the video above to watch Chicago PD online to get caught up. 

Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.

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Chicago PD Season 4 Episode 18 Quotes

Voight: Hey you're gonna miss your bus.
Kid: Who got popped?
Voight: A kid who missed his bus.

Ruzek: It's Adam. Remember I last saw you at your husband's birthday?
Nicole: Oh I remember you. I had your engagement photo pinned to my fridge for eight months.