When David Jordan, an extraterrestrial human in appearance, agrees to help U.N. Secretary General Nicholas Straka resolve an escalating nuclear crisis, he also learns he must defuse a horrifying plot to exterminate humanity by a hostile race of beings who despise human culture. Somehow, he must thwart both crises before a worldwide intervention is launched by his superiors, destroying human innocence in the process. In Reason for Existence, David learns the origins of human conflict, the nature of secret societies, the true meaning of friendship, and the enduring qualities of love.