The most important aspect of any fiction dealing with war is that the conflict isn’t interesting if the characters of both sides aren’t treated with the utmost care. A handful of archetypal British heroes fighting a group of Nazi cannibals with no depth whatsover is not worth reading; black and white war stories should have died with John Wayne. Ian Tregillis understands this. The characters in The Coldest War, and its predecessor Bitter Seeds, are all very real people, with some flaws and some admirable traits no matter which side of the conflict they are on.
In the case of Klaus, there is a German who was forced into fighting for the Nazis from a very young age after being experimented on and augmented with technology that allows him to pass through walls. Although there is a sadness that he always carries with him, he is well intended despite his upbringing. The other side of the conflict in Bitter Seeds is Raybould Marsh, a proud Brit and intelligence agent. In the time that has passed since the first novel, Marsh’s life has fallen apart and he’s become a borderline alcoholic with severe marital troubles that stem from the loss of a child and the apparent mental disabilities of a second. When the story picks up, Marsh is essentially dragged forceably from the bottle by his country to “battle” the Soviet Union in a re-imagining of the Cold War, teaming up with Klaus and his sister, Greta. Although Greta is a bit lacking in depth, but serves an important purpose in that throughout the novels she uses her ability to see the future to basically be the master of all that is going on. She is a purely terrifying villain throughout.
The “history” part of alternate history has become fuzzy with this novel, as is only natural in a book taking place more than twenty years later in a universe where the British used warlocks to fight superhuman Nazis (and thus ending the war early). It doesn’t really feel like an alternate history novel in the Harry Turtledove sort of way, but is something unique that is brilliantly well-written with some of the most memorable literary characters in recent memory. Although The Coldest War doesn’t have as many amazing single moments as Bitter Seeds, and it takes a bit longer to get rolling, it is a worthy sequel to arguably one of the best science fiction novels of the 21st century.