I have really mixed feelings about this. On the one hand, it's a gripping thriller about a protracted undersea duel between two submarine captains. On the other, it's about a rather preposterous war scenario - it's 2012 and the Germans and white South Africans have formed an alliance and are fighting the Americans in Africa, and a relief convoy is on its way there. It's a tactical nuclear war, with submarines shooting off nuke torpedoes and missiles at each other, but all the nuclear war is at sea. There are so many implausible things about this scenario I don't know where to begin. I didn't love it, but I didn't hate it either. I don't think I'd recommend it unless you were already a big fan of this kind of story. I bought it because I wanted to broaden my horizons of authors and genres, but I don't think this is a direction I wish to further explore.