Petra, a young adventurer, finds herself in the Northern Fells of Sami Land, an unknown land to her. She soon makes a new friend named Niklas. Petra and Niklas find themselves exploring the Sami Land together in search of Niklas' lost sister, Maaret. Along the way, Petra learns about the magic of the Northern Lights and how they came to be.
The Petra series of books inspired the award-winning Petra's Planet virtual world (petrasplanet.com) and familiarizes children with foreign cultures by telling intriguing and relatable stories.