The Will of the Many (Hierarchy Book 1) By James Islington

At the elite Catenan Academy, a young fugitive uncovers layered mysteries and world-changing secrets in this new fantasy series by the internationally bestselling author of The Licanius Trilogy, James Islington.
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AUDI. VICE. TACE.
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The Catenan Republic—the Hierarchy—may rule the world, but they do not know everything.
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I tell them my name is Vis Telimus. I tell them I was orphaned three years ago, and that only good fortune has got me into their most prestigious school. I tell them that, when I graduate, I will allow my strength and drive—what they call Will—to be leeched away and added to the power of those above me, as everyone must do.
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I tell them that I belong, and they believe me.
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But the truth is that I have been sent to the Academy to solve a murder. To search for an ancient weapon. To uncover secrets that may tear the Republic apart.
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And that I will never cede my Will to the empire that executed my family.
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To survive, though, I will have to rise through the Academy's ranks, and win. Because if I cannot, those who know my real name will no longer have any use for me.
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And if the Hierarchy finds out who I truly am, they will kill me.