Chicago PD season 7, episode 4 synopsis and promo: Infection, Part 3

What’s happening in this week’s Chicago PD episode? Find out about Infection, Part 3 with the Chicago PD season 7, episode 4 synopsis and teaser.

The next Chicago PD is the conclusion to the One Chicago crossover, and NBC has released an official description and promo to tease the action-packed ending!

Wednesday’s installment is appropriately called “Infection, Part 3” as it wraps up the story that began on Chicago Fire. With it clear now that the disease outbreak Chicago is facing was started on purpose, the Intelligence Unit is tasked with finding the person responsible.

Can they get to them in time before they do something even worse? And who would be able, and willing, to do such a terrible thing to innocent people? Fires are not hard, but weaponizing bacteria is much more specific.

One Chicago fans know that PD is normally the last part of any One Chicago crossover event, as there’s always a villain who needs to be found and arrested. But the last three-show event ended with a character being shot, so let’s hope this time around, we don’t have another character who pays a terrible price. (If you watch the trailer, you might start to get nervous for somebody.)

Here’s how NBC officially describes the episode:

"After zeroing in on the suspect responsible for the bioterrorism that’s gripping Chicago, the PD prepares to undertake their biggest manhunt yet. Upton is torn between helping track down the perp and providing emotional support to the scared young girl that needs her. Voight fears his team is being sent on a wild goose chase."

And here’s the One Chicago crossover trailer that’s been teasing all three episodes:

For the latest Chicago PD season 7 spoilers and news, plus more on the entire series, follow the Chicago PD category at One Chicago Center.