In World war 2, a German undercover unit infiltrates British lines during the evacuation of Dunkirk, 1939. The film revolves around their successes and failures in disrupting R.A.F. operations during the Battle of Britain.
A gunrunner loses his cargo near a small coastal Sudanese town so he's stuck there. When a woman hires him to raid a sunken ship in the shark-infested waters, he sees a chance to compensate for his losses. He's not the only one.