Fifteen-year-old Mary Charming is a quiet, kind-hearted girl living in Chicago who loves mysteries, vintage music, and detective work. While her gentle nature often makes others underestimate her, Mary believes that strength doesn't have to be loud. But when she begins hearing mysterious singing coming from beneath the ground tone night, her curiosity gets the better of her. What starts as a strange sound soon leads Mary toward a hidden world beneath Chicago, where secrets, mysteries, and unexpected dangers await. With her friends by her side, Mary must uncover the truth about the mysterious underground city while discovering who she really is along the way.
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