Nick Wechsler

After Hal and Lois leave town for a getaway, "squatters" crash Reese's party, take over the house and refuse to leave.

Kevin takes the twins to the cabin in hopes of proving himself as a father.

Rebecca hosts a dinner party. Kevin tries to support those around him. Randall faces concerns about how his family is adjusting to their new home.

When the crushed body of a young teen who ran away from a treatment center for troubled girls is found in an abandoned building, Voight sends Halstead under cover as a guard to investigate the center from the inside.

Evidence from the case of a young woman who was shot to death confirms the Chicago P.D. has a serial killer on its hands; Voight welcomes Kenny Rixton to the team when Ruzek takes another assignment.

The investigation into the murder of a sex offender leads to a private police force operating independently of the Chicago PD; Halstead checks Jimmy's DNA to find out if he really is Lindsay's father.