PPD had decided a serial bomber had died or moved on when 5 years passed with no bomb fatalities in Philadelphia, but a pilot was seriously injured in a sports club by a bomb with identical characteristics. He tells Lilly he had heard music just before the bomb went off; a janitor reveals he had seen a music box in the locker which exploded. The Cold Case team realizes they need to find a link among the seemingly unconnected victims. Written by
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