The Chicago Police Department says Samantha Mack shot her partner, Fred, during the confusion of a bungled pursuit. Mack says it was their quarry, a violent pedophile named Marco Trovic, who fired the deadly round in that darkened room. But Mack was knocked out and can't really say what happened. ? When no evidence of Trovic is found on the scene and the bullet is shown to have come from Mack's own gun, the Department labels Fred's death as a case...