Lewis and Crosetti uncover a woman's plot to murder loved ones for their life insurance; Bolander convinces Munch to pursue an old case.

A victim's ghost leads Howard to the evidence she needs to solve her case; Bolander and Munch check out an apparent homicide where the victim turns out to be alive.

While the squad work the graveyard shift, a renegade Santa Claus runs loose in the building; a mysterious candle is lit as a vigil to all the unsolved homicide cases.

Thormann's bullet wound affects Crosetti; the Adena Watson case further frustrates Bayliss and Pembleton.

Crosetti and Lewis solve the Thormann case; Pembleton and Felton spend a night out in search of a Lincoln; the jumpy Bolander gives Munch a tough time over a double murder.

Tim and Frank bring in the main suspect in the Adena Watson murder case and spend 10 hours in the interrogation room.