Timetrip: The Curse of the Viking Witch (overview)

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.