Construction workers discover a skull with bullet hole under the ruins of a disco club burned down in 1978. 22 people died in the fire. Rush and Valens come to the conclusion that the burning of the club was arson, meant to cover up a murder leaving ... (more)them with not one, but 23 cold cases.

Amanda Wyss, Ameenah Kaplan, Ciara Hughes, Conor Dubin, Joey Diaz, Johnny Palermo, Justin Meloni, Lorna Raver, Mala Wright, Michael Fairman, Nichole Hiltz, Rick Foster, Robert Cicchini, Robert Maffia, Robin Riker