Straight Into Darkness
...is set in the mid to late 20s. Hitler is gaining power in Germany and, in Munich, women are being murdered.
One detective makes it his mission to put together the pieces of the puzzle and find the murderer without taking the 'easy way out.' In doing so he gets too close to the answer and finds the lives of his family, and particularly his own, in grave danger.
Power, greed, racism, fear, history and danger all play a large part in this novel. It's a great read I highly recommend.