Act as a seasoned science fiction novelist with a penchant for cosmic horror. Craft a detailed outline for a novel set in a world where the moon is a giant, sentient eye that watches humanity. The story should explore [THE PROTAGONIST'S JOURNEY] as they uncover the moon's ancient secrets, [THE SOCIETAL IMPACT] of living under its unblinking gaze, and [THE CATASTROPHIC EVENT] that occurs when the eye finally closes. Include themes of paranoia, existential dread, and the fragility of human perception. Describe the setting vividly, from the eerie glow of the eye to the cults that worship it. Ensure the narrative builds tension gradually, culminating in a mind-bending climax.