Terror in the Midnight Sun is a Swedish science fiction/horror film from 1959. I'm having trouble finding reviews. There are still shots and information on the plot here.
I really like this one. The location photography is wonderful, with scenes from planes and lovely shots of ice skaters and skiers. Just beautiful. And the music was a treat. The movie does build slowly and the tension and edge-of-your-seat feeling is completely missing, but it's an interesting trip throughout with an intriguing resolution.
Watch it online at youtube: