For decades people have shot stills and video footage of UFOs and convinced nobody. In a remote Norwegian Valley there have been frequent appearances of both craft and light orbs for the past twenty years. The reliability of sighting has attracted the attention of various scientists in particular those keen to snap one clear spectrograph of these illusive orbs. With a clear spectrograph in the can a mystery that has haunted much of humankind for the past half century might be put to bed. Trick of the Light observes the quirks and dilemmas of scientists as they dodge the ridicule of their peers and the hunger of UFO groupies in their search to know what makes these light anomalies tick.