Did the team manage to find the people who were selling a drug?
That was a key question on Chicago PD Season 4 Episode 5 when it became clear that the drug played a part in multiple overdoses around the city.
Meanwhile on this addictive drama series, Tay and Burgess came across a bloodied child who shared a twist about his home life.
Also, Mouse contemplated returning to the Army, but how did his team feel about it.
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.