John D. MacDonald 
One Monday We Killed Them All 

Step by step, Dwight Mc Aran built a wall of vicious hate around himself. It was easy. He was a man who could slap one woman to death because she loved him, and hum a love song to another while he raped her.Sure, he did some time in jail. He sat in a cell and simmered for five long years until his hate hardened to a core of white-hot evil. Revenge was all he craved — and a plan was what he had — a plan just cruel enough to please him, and just crazy enough to work.