It's Hiccup's birthday, but that's not going to keep him from getting into trouble. To save his dragon, Toothless, from being banished, Hiccup must sneak into the Meathead Public Library and steal the Viking's most sacred book.

It's Hiccup's birthday, but that's not going to keep him from getting into trouble. To save his dragon, Toothless, from being banished, Hiccup must sneak into the Meathead Public Library and steal the Viking's most sacred book.

In the fifth adventure in the How to Train Your Dragon series, someone has stolen the Fire-Stone. Now the volcano on Volcano Island has become active and the tremors are hatching the eggs of the Exterminator dragons! Can Hiccup return the Fire-Stone to the Volcano, stop the Volcano from erupting, and save the Tribes from being wiped out by the terrible sword-claws of the Exterminators?