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Unleashed from caves used for occult rituals, a microscopic evil invades the world-an infestation that deceives, blinds, kills, and then spreads and kills again.

Professor McKinney, an atheist ex-priest, and the Harbingers team confront a supernatural mystery, a case of murder, and an exploration into the darkness of the human heart--all centering around a

Four Bestselling Authors Team Up for Thrilling Supernatural Suspense Gathering four stories from four bestselling author friends, Invitation is the first collection in the ongoing Harbingers series