An industrialist hires McKeever and Buckley to make a dangerous parajump to deliver priceless cargo. Guided by carefully written instructions, the Ripcord jumpers run afoul of serious opposition.

The skydivers have one of their most trying and exciting experiences while trying to salvage a ship loaded with high explosives. The boys land on a deserted ship and clash with salvage skipper Leach. The cargo? TNT and nitro.