The Moon of Mystery is a fantasy novel set in a world of cultivation. On the Xuan Yue Continent, cultivators ceaselessly pursue power in their quest for the immortal path and eternal life. The main story follows Lin Hao, a disciple of the Qingyun Sect. At first, he is an outer-sect disciple with only mediocre talent, but after a strange event tears open a rift in the heavens, he encounters a mysterious power and begins his gradual rise to prominence.
The story begins with a celestial upheaval over the Xuan Yue Continent. Sect Master Ling Tiance of the Qingyun Sect and his disciples witness a black iron coffin fall from the sky. The mysterious young man inside predicts that the demonic calamity is about to return and demonstrates his formidable power. Soon, the threat of the demons begins to engulf the entire continent, forewarning the arrival of a great catastrophe.
During his cultivation, Lin Hao unexpectedly hears guidance from a mysterious voice within him, causing his power to grow rapidly. Though this power is dangerous, it becomes crucial to his survival in adversity. When the Qingyun Sect opens the Xuan Yue Secret Realm trials to prepare for the demonic calamity, Lin Hao gradually distinguishes himself. In the secret realm, he obtains a powerful spiritual artifact, further enhancing his strength.
The novel's storylines include fierce clashes between cultivators, the steadily advancing threat of the demons, and disciples from the great sects competing for opportunities in the secret realm. Lin Hao's growth is closely tied to the power hidden within him and the secrets beneath the Heavenly Abyss. His fate will also shape the future of the entire Xuan Yue Continent.