Attention, Blue Bloods fans: you cannot miss this Friday's episode.

How come? Because CBS says so in the following preview!

The network also bills "Chinatown" as the episode that will make headlines, as it focuses on an Internal Affairs investigation of Jamie after he witnesses a crime and screws up a FBI sting. Danny works to clear his brother's name, while Frank struggles balance his role as a father and a boss...

[video url="http://www.tvfanatic.com/videos/chinatown-preview/" title="Chinatown Preview"] [/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.