Read: Flood Tide
Given that Cussler's business is to entertain, writing fictional novels that are a mix of adventure and mystery, it is quite astonishing how he almost always embeds his indestructible hero Dirk Pitt in a plot of international political, ecological or economic crises.
This time he broaches the issue of illegal immigration, its probable social and political consequences for the United States on the one hand, and, on the other hand, the ecological and economic issues related to a dynamic, even skittish natural environment like the Mississippi river. The usual love interest, mayhem and personal vendetta are thrown into this mix, too. The result: one of Cussler's better Dirk Pitt novels.