Strange #5

A man discovers a fortune in lost gold hidden in the Seine River and becomes obsessed with retrieving it, but his greed and the complications of wartime France create obstacles to his plans. A French Navy officer employs radar technology to search the river bottom, leading to the discovery of cases of gold, but the protagonist's suspicious activities draw the attention of the F.B.I., who investigate whether he might be a foreign spy rather than a legitimate treasure hunter. Ultimately, his naval service and cooperation help clear his name, and he is credited with the discovery.