Who sent Lindsay flowers?
That was a key question on Chicago PD Season 4 Episode 6 when a mysterious individual sent them.
Meanwhile on this addictive drama series, Burgess and Sorenson discovered a dead teen girl at the home of a baseball play who was friends with Olinsky.
The pair also hunted a thief who turned out to be a cop with a rocky past, but who knew him?
Use the video above to watch Chicago PD online to get caught up with the latest drama for the characters in this spin-off of Chicago Fire.
Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.