An annoying floater takes a romantic interest in Violet. Ritter catches a local politician in a compromising position. Mouch and Severide help Trudy with an arson investigation.
To glean insight into the elusive BTK killer, Bill and Holden interview the Son of Sam, who makes a startling admission.
Amid sweeping changes at the BSU, Holden deals with severe repercussions from his close encounter with Ed Kemper.
Wendy considers an offer. Holden and Bill struggle to communicate the meaning of their findings to the judicial system in the baffling Altoona case.
