In 1361 the Danish King Valdemar's troops approached the city walls of Visby, Gotland. Meanwhile, a young woman named Sigrid was leaving tracks all over the place leading to the whereabouts of a great treasure.She was able to fulfill her mission before being captured and immured alive in a tower, as punishment for not revealing the whereabouts of the treasure. Currently Kathrine, 14, and his three friends have to follow... see more