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Are history lessons boring? Fourteen-year-old Alex thought so-until history tried to kill him.
Alex and his younger sister, Maya, never imagined that cleaning out their grandfather's dusty attic would lead to an ancient mystery. Hidden inside a forgotten naval map is the Chronos Key, a strange, golden pocket watch that doesn't just tell time-it opens gates to it. When an accidental twist of the Key rips them out of their present, Alex and Maya crash-land in Aethel, a secret Atlantean city trapped in a temporal bubble beneath the crushing force of the deep ocean. The city is beautiful, silent, and dying. Now, with a 24-hour countdown ticking on their wrists, Alex and Maya must navigate a labyrinth of silent, powerful security sentinels and impossible riddles to find the Temporal Crystal and fix the catastrophic Time Fault they accidentally created.
But the deeper they descend, the more terrifying the truth becomes: The Time Fault was no accident. Someone wanted the Key to bring Alex and Maya to the brink of the Crystal Core. They made it to the Core. Now, they must face the Shadow who was waiting for them.
