Chuck Zukowski is obsessed with tracking down UFO reports, but this innocent hobby takes on a sinister urgency when he makes a horrifying discovery. As he traces a series of incidents across Utah, Colorado and Kansas, a pattern emerges: a horizontal line of unexplained activity stretching right across America, a line some are calling the 'UFO Highway' or the '37th Parallel'.

His extraordinary journey takes him from El Paso to the Pentagon, into secret underground military caverns and Indian sacred sites. This terrifying account will keep you awake at night, pondering some of the biggest and most inescapable questions humanity faces: are we really alone in this vast universe? And if not, who are our neighbours?