Cisco and Pancho get involved when a gang of jewel thieves are prevented from getting their package by a by - the - book postal clerk and decide to take it by force .
Jewel thieves 've mailed themselves part of their haul .
Cisco and Pancho get involved when a gang of jewel thieves , who 've mailed themselves part of their haul , are prevented from getting their package by a by - the - book postal clerk and decide to take it by force .