From the top 100 free list
Sometimes evil is not born of madness, but madness of evil.
A rogue CIA agent partners with the brother of a slain colleague to uncover a conspiracy deep in the intelligence community. But a shadow follows them: a killer bent on a revenge so terrible, it is only matched by the crimes committed against him. In the end, no one escapes unscathed, no beliefs will go unchallenged, and no wrong will escape the terrible, final, and extraordinary retribution.