In the spring of 1997, thousands of residents of Phoenix claimed to have witness mysterious lights in the sky. This phenomenon, known as “The Phoenix Lights,” remains the most famous UFO sighting in American history. On July 23, 1997, three students went missing while investigating the strange source of the lights in the nearby desert and were never seen again. Twenty years later, Sarah Bishop, a documentary filmmaker and younger sibling of one of the missing, returns to Phoenix to delve into the their disappearances. Nothing can prepare her for the shocking discovery of a tape from the night her brother and his friends disappeared.