Mysterious green fireballs nearly cause a nuclear disaster during a weapons test, and Hynek and Quinn must investigate how it could have occurred.

After a Scoutmaster vanishes when he and his troop witness a strange craft hovering in the woods, Hynek is sent to investigate for Project Blue Book, while Quinn is pulled into a rogue mission for General Harding.

While reminiscing on the set of `Close Encounters of the Third Kind', Hynek recounts his experiences with the infamous Robertson Panel and the eccentric alien contactee for whom he put everything on the line.