I guerrieri venuti dal nulla

A series of disturbing events takes place in Colorado: a man dressed as an ancient Egyptian is found dead in the snows of Aspen, the planes crossing the skies of the state are struck by the notes of a disturbing melody, one of them is shot down by a spear "falling from the sky" and, furthermore, Egyptian warriors kill men and cattle, disappearing into thin air after striking. It's up to Martin Mystère to shed light on all these enigmas...