This second standalone graphic novel based on the film series is a new adventure that takes place shortly after the events in How to Train Your Dragon 2, during the period in which Hiccup is desperately trying to fill his father's role as the chief of Berk. Created with the help of the film's writer, director, and producer, Dean DeBlois, it bridges the gap between the second and third films. Hiccup, Toothless, and the rest of the dragon riders encounter two deadly yet mysteriously linked threats: One is an island consumed by Dragonvine, an uncontrollable force of nature that's poisonous to humans and deadly to dragons. The other is an all-new, all-terrifying dragon species--the web-spitting Silkspanners!

本作は、父の跡を継ぎ若き族長となったヒックの孤独な葛藤を、映画二作目と三作目を繋ぐミッシングリンクとして鮮烈に描いています。猛威を振るうドラゴンヴァインを鏡に、自然との共生や指導者の重責というテーマを浮き彫りにする、極めて哲学的な一冊と言えるでしょう。 映画監督自身が携わった本作は、映像のスケールを継承しつつ、紙面特有の表現でヒックの内面を精密に補完しています。完結編へ向かう彼の覚悟を理解する上で、映像と本作が共鳴し合うシナジーは不可欠であり、ファンを真の完結へと導く情熱的な架け橋なのです。