This is a preloved book in very good condition.
Cass and Max-Ernest are proud new members of the top-secret Terces Society, and can't wait for their first mission. Soon they are kidnapped by their dastardly enemies, discover the powerful and mysterious Sound Prism, and find themselves in a race against time to track down a monstrous manmade creature who guards the secret of eternal life.
Publisher: Usborne Books
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