Investigations have traced the source of erratic radio signals to a giant alien vessel, orbiting the Earth high in the exosphere. That the craft is hostile, there is no doubt; somebody will have to go aboard and find out how to eliminate the threat.

Investigations have traced the source of erratic radio signals to a giant alien vessel, orbiting the Earth high in the exosphere. That the craft is hostile, there is no doubt; somebody will have to go aboard and find out how to eliminate the threat.