In The Grey Seas Under, Farley Mowat writes passionately of the courage of men and of the small oceangoing tug Foundation Franklin. From 1930 until her final voyage in 1948, the stalwart tug's dangerous job was to rescue sinking ships, first searching for them in perilous waters and then bringing them back to shore. Battered by towering waves, dwarfed by the great ships she towed, blasted by gale-force winds and frozen by squalls of snow and rain,...