12-year-old Zet tries to visit his best friend, a young student-apprentice at a jewelry workshop. But the huge, snaggletooth man at the door won't let him in Something strange is going on behind those tall, spooky gates. Is Zet's best friend in trouble?

Zet and his sister Kat have a mystery on their hands. The siblings start looking for answers. Then Zet and Kat receive a strange amulet. It's a clue, but to what? Can they solve the message of the amulet and rescue their friend?

The young sleuths set out to follow the clues. Little do they know...