After the Grimes sisters’ corpses are discovered under a bridge, the police try to nail down the perpetrator amid a heavily mismanaged investigation. The gruesome crimes hearken back to an earlier Chicago crime—could the girls be the victim of a serial killer? Chilling phone calls made to the girl’s mother suggest so. Carter and Wenndy investigate the girls’ deaths, and whether it was premeditated or it was just bad luck. 

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