Professor Poopsnagle, the holder of an important scientific mystery, was kidnapped and his mysterious disappearance undermines the world of science. His young grandson, who helps him in research, provides assistance to professor Garcia, a longtime colleague and friend of the scientist. Helped by a group of children spending their holidays in a secret camp in the valley, Professor Garcia and the young boy build a flying bus. They set off in pursuit of the kidnappers and an attempt, at the same time to complete Poopsnagle's unfinished work.
Pyrus is a young elf who lives in The Danish National Archives, where Chief Archivist Birger Bertramsen work alongside his new assistant Josefine Brahe. The young elf lives together with the old Archivist elf Gyldengrød and the elf girl Kandis, who just moved in and the.
Pyrus complains that he cannot get Christmas-presents, as Santa Claus doesn't give presents to elf's. Pyrus tries to conjure him with the help of a magical book to talk to him, but unfortunately Santa Claus is already in the National Archives when he does, which results in Clause losing his memories. Now the elf's must help Clause regain his memories by visiting historical events using the books in the archive. They meeting Saint Nicholas (the predecessor of Santa Claus), La Befana (who comes bearing gifts in Italy) and the American Santa Claus.