Josh, the oldest of three boys, has always admired Vikings.  He is brave and afraid of nothing.  However, his younger twin brothers are getting bigger and wilder, which does worry him.  While staying with their grandparents, they all take an adventure to Viking World.  At the same time, Thor and the gods in Asgard are watching over them.  As the twins get into mischief, Josh spies them on a Viking ship just as archers with flaming arrows are about to demonstrate a Viking funeral.  A similar problem is happening in Asgard as the dragon, Fafnir, is about to attack.  Josh finds an inner strength to protect his brothers – in a way that also helps the gods protect Asgard!  The large, colorful illustrations add many details to the story.  Throughout Viking World are runes on wooden beams.  A key in the back helps decode the messages.  They are quotes about dragons and bravery from Tolkein, Neil Gaiman, John Lennon and Churchill.  Awesome addition!  This book is a real treat on many levels.