This is book number 3 in the How to Train Your Dragon series.
A Viking lesson in pirating takes a strange turn when Hiccup and his best friend, Fishlegs, accidentally raid the wrong ship while trying to escape Sharkworms. The two lads rescue a tiny yet arrogant nanodragon named Ziggerastica, but then they are kidnapped as part of a vicious plot to steal every dragon on the Isle of Berk. Hiccup must rely on his tiny new friend-and his ability to speak Dragonese-to save the day ... again
The rollicking sequel to How to Train Your Dragon and How to Be a Pirate offers a fast-paced plot, slapstick humor, and witty dialogue.