Mark Clifton 
Eight Keys to Eden 

Not long after the colonists landed on the uninhabited planet every human made artifact – ship communicators, tools–disappeared! Even their clothes! Here is an enthralling science alien planet puzzle from the man writer, critic and Nebula award winner Barry Maltzberg calls ‘One of the twelve most influential science fiction writers.’ When, Eden–the Earth colony eleven light years goes silent and fails to answer any communications from the mother planet, Earth’s government goes into a panic. Has something tragic happened on a world already proven to have no intelligent, dangerous lifeforms? Or, are the colonists purposely disregarding the messages for some reason of their own? What could be the real explanation for the mysterious silence of a disciplined, scientific colony?