: Olinsky confides in Sergeant Trudy Platt that he has a newly discovered daughter, Michelle, who is in juvenile detention. Subplots :

The episode follows the Intelligence Unit as they track down Derek Keyes (played by guest star Bokeem Woodbine ), Chicago's most-wanted heroin kingpin. The mission becomes critical when Detective Jay Halstead is abducted and tortured during an undercover operation gone wrong.

Burgess discovers a mysterious medical needle in Roman's bag. Sergeant Hank Voight Jason Beghe Detective Erin Lindsay Sophia Bush Detective Jay Halstead Jesse Lee Soffer Detective Alvin Olinsky Elias Koteas Officer Kim Burgess Marina Squerciati Sergeant Trudy Platt Amy Morton Detective Antonio Dawson Episode Conclusion

: Following her resignation and a three-week downward spiral involving heavy partying with her mother, Bunny, Erin Lindsay is called back into action by Alvin Olinsky to help save Halstead.

Officer Sean Roman voices his concerns to Kim Burgess about her engagement to Adam Ruzek.