After a massive solar flare destroys the Earth's eastern hemisphere, an emboldened treasure hunter for hire adventures to Europe to uncover the coveted Mona Lisa, only to learn the world needs a hero more than it needs a painting.
When Hiccup and Toothless discover an ice cave that is home to hundreds of new wild dragons and the mysterious Dragon Rider, the two friends find themselves at the center of a battle to protect the peace.
Scotland and England have been at war for years. After the death of Richard DinesMurray was stops so a treaty of peace can be signed until the body of Jamie McDonald is found in the streets hung upon a spike. Robert and his friends must reclaim the throne of Scotland.