1361年,当丹麦的军队逼近瑞典的威斯比城的时候,在哥特蓝岛上,一个小女孩发现了传说中的宝藏线索,并且知道就藏在威斯比城的墙壁上。现在,这个14岁的丹麦女孩和他的三个朋友,必须从大约700年前遗留下的线索到威斯比城堡去解救她的父亲和寻找到传说中的宝藏。14 y.o. girl's dad is kidnapped by men, who are interested in the Knights Templar treasure. With 3 friends she sails from Bornholm, Denmark, to Gotland, Sweden, to free her dad and perhaps even find the treasure.