Josh chases fortune stolen by loyalists to Britain's crown during the American Revolution. Jumping into two investigations of the infamous Doan Gang, Josh helps dig up a cache of plundered coins. Later, a cave search pinpoints the turncoats' hideout.

Just off Florida's coast, Josh Gates braves shark-infested waters in search of an American ship sunk by a Nazi U-boat during WWII. Josh joins Tristan Guttridge who has a bold new strategy to use sharks as spies to uncover the wreck.