Siblings Valdemar and Sille meetings scientist Benedict and his time machine. With one begins an exciting but perilous journey back into the history of Denmark. Benedict is in fact not an ordinary man. The Vikings threw sorceress Volva its spell on Benedict and made him immortal. When he can not travel back in time and do away with Volva, he needs Valdemar and Sille help.

Denmark in the darkest Middle Ages. The King decides that his son Valdemar must travel to Bishop Eskil to get an education. Meanwhile he and his knights have to go off to war. Aske, the kitchen boy, soon becomes the prince's best friend. The boys unexpectedly come across a secret meeting in the woods, lead by Bishop Eskil. The men are plotting against the King. Valdemar is more determined than ever to get to his father before it's too late ...