Madeline and Jack's adventures steer them onto mysterious, mist-covered shores when they find themselves aboard a Viking ship-headed for a land where shape-shifting berserkers are stealing Viking gold. But Madeline and Jack soon face even greater danger. A Viking girl is determined to blame the thefts on them, and the mystery grows deeper when it seems she might be a berserker herself! With each clue they uncover, Madeline and Jack are pulled deeper into Viking legends of sea giants, magic, and shape-shifting beasts. Will they uncover the truth behind the legends in time to escape? Or will the magic of the ancient Vikings trap them in the past forever? This is the third book in the Madeline M. series, and it steers Madeline and Jack onto mist-covered shores full of Vikings, shape shifters, and stolen treasure. For readers 8 and up.