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The author of the novel Intensity is Dean Koontz, best known for his intense writing style and suspenseful thrillers. The book was later adapted into a gripping TV miniseries featuring the talented actor McGinley, bringing Koontz's work to life on screen. Koontz's novel captivates readers with its psychological suspense, complex characters, and the ever-present sense of danger that keeps them on the edge of their seats throughout the story.