David Howarth, author of "We Die Alone," tells another little-known story of courage and survival during World War II. This time he writes of the "Shetland Bus," a fleet of fishing boats that made regular journeys across treacherous waters from the Shetland Islands to Norway, in order to bring relief and fortifications to Norwegians weathering Nazi attacks. Howarth, who was second in command at the Shetland base, knows the story first-hand, and brings out the ferocity of the storms and battles endured by a few hundred brave men.  (NOR26, $16.95)