Viking Ships at Sunrise Author:Mary Pope Osborne "Beware of Vikings!" warns Morgan. Then Jack and Annie are whisked back to ancient Ireland. They land on a cliff on a misty island. How will they find the story they are looking for? It will take a Viking invasion, the help of a jolly monk, and a lot of courage for Jack and Annie to succeed in Magic Tree Houose # 15 Vikiing Ships at Sunrise.