Sometimes it seems like every Tom, Phillip K. Dick, and Harry Turtledove wrote books that asked what would have happened if Hitler won the war. 
 It's 1964 and Germany is preparing to celebrate Hitler's 75th birthday. Police detective Xavier March is called in when a body is pulled out of a river, and he soon discovers that the dead man was a prominent member of the Nazi party. March's investigation eventually leads him to secrets going back to the war that his government is desperate to keep buried. 
 So yes, this is another book about the most asked question in alternate history: What if the Nazis won World War II? But by framing this as mystery thriller Robert Harris has taken a different approach to it by using March as tour guide of a victorious Germany. We eventually have the bigger picture of what the rest of the world is like, and there are some interesting elements like the US did fight and defeat Japan yet Europe is Nazi controlled so that America and Germany have had an extended Cold War. 
 While the details of the world are well done this is really more of a story about what life would be like in this society. It's all well-ordered prosperity on the surface, but the police state nature of it all lurks just below the surface with the average citizen's paranoia encouraged by the government to keep them fearful and obedient. 
 March is an interesting character in this as a man who did his part in the war on board a U-boat, but he doesn't much like the SS uniform he wears now. He reminded me a lot of the series by Martin Cruz Smith about Russian detective Arkady Renko. Like Renko, March is a basically good man who knows he's working for a bad system, but he's too cynical to think of trying to change it. Instead he just tries to find what justice he can even as he still has too much integrity to entirely go along with the program which is something that the true believers can sense and hate. 
 This all sounds like a 4 or 5 star book, especially in the capable hands of Robert Harris, but unfortunately it's one of those where I liked the idea of it more than the actual finished product. This alternate world is intriguing and well thought out, and March is an interesting lead character, but the actual plot just seems kind of flat and obvious. You can tell much of what's coming for a good long while so there's not much suspense or shock to it.