Until now, Turtledove has interested me only slightly. Alien invasion during WW2? Naah. 20 books of a continuity where the Confederacy first wins the US Civil War and we get two much more even (and bloody) World Wars? Naah.
However, a friend of mine gave me as a birthday gift
Hitler's War, which is supposed to begin a new "continuity". In that, WW2 breaks out a year and half earlier because Britain & France refuse to give Sudetenland to Hitler in Munich talks. Because it's just recently diverged, it's much closer to reality and thus much more "grabbing". Also, low-tech and no Wunderwaffen is also a nice read. Pz1's pressed into frontline use, Pz2 being the German "main battle tank", Matildas still not having 2pdrs installed but a single MG instead, Gloster Gladiators still seeing frontline service...
In fact, the book made me interested in the early war and wishing to see '39-'40 scenarios in FH2 too