Turtledove's latest twist on history has the Japanese invading Hawaii in December 1941. The strategic consequences of the U.S. being backed up against its own West Coast, with most of its navy's aircraft carriers sunk, are too extensive to be dealt with in one novel, and one viewpoint character, Joe Crosetti, is training as a naval aviator for the battles to come. But as usual, Turtledove provides an extensive range of characters, civilian and military, of both sides and all ranks. Minoru Genda and Mitsuo Fuchida, both real historical Japanese officers, perform with their expected brilliance. On the other hand, Corporal Shimizu rides ashore in a landing barge and gives a grunt's-eye view of the Japanese army, whose motto is, quite understandably, "Hard work!" U.S. artillery officer Fletcher Armitage and his wife, Jane, were on the verge of divorce when the balloon went up and are now even more thoroughly separated as he labors in a POW camp, and she survives off her turnip patch.