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The final book in the series that inspired the How to Train Your Dragon films. In this twelfth adventure, can Hiccup save the dragons? It is the Doomsday of Yule. At the end of this day, either the humans or the dragons will face extinction. Alvin the Treacherous is about to be crowned the King of the Wilderwest on the island of Tomorrow. His reign of terror will begin with the destruction of dragons everywhere.
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