Out of the Blue..The Whistlers! Interplanetary invaders dropping out of the skies of Grautier from its neighbor world to menace the 8000 men & women exiled from earth & struggling to create a new life far from the interstellar routes of space traffic..& far from any outside help. Grautier, a gray beast of a world whose inhabitants have so far been found to include a semi-intelligent race of monkeys--the Mungos--and strange Blue Dwarfs endowed w/amazing parapsychological & paramechanical powers. It's an unsettling time for the settlers as they are forced to defend themselves against the..Whistlers. A mysterious young man from earth--Chellish--has strict orders from Perry Rhodan himself regarding the Grautierians. Learn his role as one of--The Guardians.