Book – Klaus and his sister Gretel were sold to the Doctor when they were children, and ten years later, after innumerable surgeries, experiments, and hours of training, they and their companions are the secret weapons of the rising Reich. Klaus can walk, insubstantial, through walls or hails of bullets with equal ease; his rival can burst into flames at will; and his sister Gretel’s powers, though less dramatic, are no less important, because she can see the future consequences of all their actions.
Meanwhile, across the Channel, the British Secret Service has formed an even-more secret organization called Milkweed to figure out how to combat the German supersoldiers whose existence they’ve stumbled upon. Raybould Marsh, an up-and-coming SIS agent, recruits his old friend William Beauclerk, the younger brother of a Duke and, more importantly, one of Britain’s secret network of warlocks, able to negotiate favors from impossibly powerful beings with control over the very fabric of reality.
Nazi supermen versus British warlocks — Bitter Seeds (the first book in the Milkweed Trilogy) is like a comic book movie in novel form, in the best possible way. While the Nazi doctor sometimes falls into cartoon-villain territory, Klaus and Gretel more than make up for it, and the machinations of the British warlocks are mesmerizing in their horribleness. This is a dark alternate history (although perhaps no darker than World War II actually was) where everybody makes terrible choices in the service of winning the war, without stopping to think about what will happen if they do.
If you like Marvel’s Captain America movies or the X-Men in any form, do yourself a favor and pick this up. Another great alternate-World War II novel is Jo Walton’s Farthing, an English country house mystery set during the long peace between Britain and Nazi Germany.