In the shadowy depths of the Mountain of Meridian Gyre, twin sisters Cassia and Petra uncover forbidden secrets hidden in unmapped galleries of an ancient library carved into living rock. As a mysterious compass points toward their deepest fears—and their father's vanishing three years prior—the sisters delve into whispers of lower levels beyond official maps, where truth and terror converge in bioluminescent gloom.

Haunted by overheard conversations and their father's legacy as a Senior Acquisitioner, they question the compass's true power and the Collective's hidden archives, racing against unseen forces guarding the mountain's lowest mysteries.

Key Topics Covered:

• The enigmatic compass that reveals personal fears
• Carved libraries in the Mountain of Meridian Gyre
• Sisters' rivalry and unspo ...