These are mysteries with historical and cultural content. Mortensen is a fun and good-natured hero who trots the globe and travels throughout history. Educational back matter offers the readers more information on the topics covered.When a book collector shows Mortensen an illuminated manuscript from 1512 with a drawing of an airplane in it, he knows he has a mystery to unravel. He travels back in time and sneaks into a Scottish castle looking for clues. He is discovered and thrown in a dungeon, but he escapes with the help of a wise scribe and a mute witch. But he's still no closer to solving the mystery. How did the airplane arrive in 1512? And why does the witch have a secret collection of books, dating from 1212 to 1929?
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