Intelligence is in pursuit of Derek Keyes
number one on Chicago's Most Wanted list
and heroin kingpin. Meanwhile, Halstead
tries to get through to Lindsay as her
downward spiral continues after her three
week absence from the unit. At District
Olinsky opens up to Platt about a secret
from his past. Roman expresses his
concerns to Burgess about what she's
getting into by marrying Ruzek