Tregillis’ conclusion of the Milkweed Triptych is the pièce de résistance of the series. Necessary Evil is a perfect marriage of science fiction, fantasy and alternate history. His narrative flows seamlessly, and his plot is fantastically convincing. Tregillis’ characters astound, the villains as well as the heroes, especially honorable, tormented yet heroic Raybould.
In 1963, as the world implodes around him, Raybould Marsh goes back in time to change the future by altering the past. Seeking Gretel, the Nazi clairvoyant whose ability to shape the future is critical to his scheme, Marsh arrives at the beginning of WWII. It’s a time before the destruction of his family, when the British warlocks are just being summoned to aid the war by communing with the supernatural beings, the Eidolons, and before anyone knows that the Eidolons’ final blood price will be apocalypse. (TOR, Apr., 384 pp., $25.99)