Riley Fitzhugh is temporarily made officer in charge of the naval guard on board the SS Carlota, a merchant ship assigned to deliver bombs and aviation fuel to the Sebou River during Operation Torch. The Atlantic crossing was supposed to be in convoy, but Carlota breaks down after surviving a U-boat attack and is forced to limp along alone. At the mouth of the Sebou River, Riley rejoins the Nameless, an anti-U-boat vessel,...