Intruders on the Moon - Novella 1957

This story is also known as 'Intruders'. It first appeared in 'Fantastic Universe' in April 1957. It appeared later in 'Tomorrow's Gift' in 1958, in 'News from Elsewhere' in 1969, in 'Flights to the Moon' in 1970 and in 'Unborn Tomorrow' in 1971. The story is about... (coming soon)