For generations mysterious lights have been observed in the remote valley of Hessdalen, Norway. On several occasions flying beneath treetops at varying speeds. The phenomenon has been reported as large as a house or as small as a soccerball. Often executing breakneck manouvers, or heading for outer space with speeds up to 20.000 mph. Both Norwegian and international researchers have been involved in trying to reveal the true nature of the mystery. There are many theories, from unknown natural energy phenomena to extra-terrestrial visitors. The film gives a comprehensive overview of the situation, with amazing picture documentation and eye-witness testimonials.