Clive Cussler's The Corsican Shadow

France, May 1940. As the German army blitzes Europe, a French curator must take a mysterious cargo out of the country. When his intended ship sinks, his cargo's uncertain fate rests on a decrepit steamer, sailing under German fire. Decades later, an expedition leads Pitt to a shipwreck's cache of diamonds which are stolen soon after. Pitt and the NUMA agency now face a murderous scheme with far more destructive plans.