Marko and Miranda are home alone after their parents and grandfather's disappearance when two strangers give them a mysterious letter.
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The Young Adult category is unique as the audience it caters to is caught between two worlds—one of children and the other of adults, so it spans the age
group of 12 to 18 years and sometimes even beyond up to 25 years of age.
In this amazing adventure, Thea's friends the Thea Sisters head to Peru, where a good friend of Paulina's is in danger. There, the five mice climb the Andes mountains in search of a mysterious treasure that's hidden in the Secret City of the Incas. Readers will love following the clues to help the Thea Sisters solve the mystery!