One day we received a letter from a stranger. Grauben's idea worked! A Dutch radio operator says he detected Morse code from the direction of the moon!

It included the word "Cavor" and he recognised it from Grauben's book. So Uncle survived!

He did just what he said he would - he befriended the selenites. He learned some of their language, and met their rulers, mysterious creatures with larger brain casings.

Uncle is sending these messages without permission. He says that the head selenite is very interested in learning how humans wage war. In the next transmission, Uncle sounds frantic. He begins to send detailed instructions for making cavorite, then suddenly the transmission ends. We never hear from him again.

I have vivid dreams. I see Uncle dragged away, fighting, struggling. Further and further away, into the silent darkness.

But Grauben says we are the ones who should be afraid.

I remember when the Martians first appeared. Grauben found evidence that they might be not from space at all, but from underground. Learning of the selenites' underground world, and their big brained rulers, is the final clue.

For the past year we've been expecting an invasion from outside. Grauben thinks we've been looking in the wrong direction.

The Martians are probably already here. And probably have been for thousands of years. If we are to find them, we need to start looking underground.

Next: Journey To The Center Of The Earth