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.

Karla invites Katrine to spend the holidays with her, hoping they might become best friends. As it turns out, nothing goes as planned. Karla meets Jonas and falls in love for the first time, and she nearly forgets all about Katrine. However, the two girls are forced to put their difficulties aside for a while, as they join Jonas in exposing a local gang of thieves.