When the Roman playwright Plautus penned his famous epigram, "man is a wolf to man," he recognized fully that the basest human emotion is hatred. People have attempted to understand this human flaw in terms of political, social, psychosexual, or even biological drives. Unfortunately, multifaceted and complex by any standard, understanding remains elusive. Jack Levin and Gordana Rabrenovic, both experienced and properly disciplined scholars, have written a remarkably creative and thought-provoking work. It is probably the most interesting book of this type that I have ever read, and, although modest in length, took substantially longer to review than I would have anticipated—not because it is written in a tortuous, pedantic, or tedious style but, rather, because it made me think. In each chapter, the reader will find that the references the authors use are right on the mark and are concordant with other scholarly publications.