A strange and vicious attack of mental energy is unleashed on the occupants of Explorer Globe 13 during a routine mission to find mineral wealth in a distant planetary system. Only Keek, the vessels alien menial remains unaffected. For the rest it is just the beginning of a grim struggle for survival. What is the reason behind these terrifying attacks and who is their invisible enemy? when Andri. the taciturn Frenchman, discovers the valuable gem stone hyperblum, could it be that he has found the mystery of the wandering worlds?
Used availability for Terry Greenhough's The Wandering Worlds
July 1976 : UK Hardback
December 1977 : UK Paperback