Dragons: Riders of Berk Vol. 4: The Stowaway
The Dragons Training Academy gets a new student - a handsome, brave young man named Hroar! It seems that Hroar has stowed away on one of Berk's ships to visit Berk and check out the dragons. And as Hroar becomes more and more popular by impressing Hiccup's friends (especially Astrid), Hiccup grows increasingly suspicious of him!