How to Train Your Dragon 6 Books Collection Set By Cressida Cowell (Book 7 to 12)

How to Ride a Dragon's Storm: Book 7
Trapped on The American Dream II with his friends Fishlegs and Camicazi, Hiccup must ESCAPE the barbarian Norbert the Nutjob, and somehow dodge the cruel Polar-serpents in the icy waters below.

How to Break a Dragon's Heart: Book 8
Whilst searching for his lost friend Camicazi, Hiccup and the Hooligan Tribe have ended up on Uglithug Island. Now UG, the most brutal King in the World, sets Hiccup the Impossible Task. He must venture to the Isle of Berserk to pass his test or DIE trying. 

How to Steal a Dragon's Sword: Book 9
Bad times have come to the Archipelago. Ever since the woods of Berserk burned down, it is almost as if the world is cursed. Dragons are starting to revolt against their Masters. 

How to Betray a Dragon's Hero: Book 11
High up in the treacherous mists of the Murderous Mountains, Hiccup and the Company of the Dragonmark are in hiding. The witch's Spydragons are guarding the shores of Tomorrow - but Hiccup is determined to become King of the Wilderwest.

How to Fight a Dragon's Fury: Book 12
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.