Viking Ships at Sunrise (Magic Tree House #15)Author/s: 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 Viking Ships at Sunrise.