‘We left Lorien in a very big hurry. The planet was under attack from the Mogadorians. We didn’t have time to gather as much information as we should have. We knew places like this existed, but no one knew exactly where they were, or what they did. Clearly, for all the information we did manage to gather before we left, there were important things that we didn’t get,’ he explains.

‘Follow me, everybody,’ Eight calls out, gesturing for us to follow his lead towards a dark corner of the room. ‘It just gets weirder and weirder.’

He stops in front of a huge carving. It is ten feet high and twenty feet long, split into different scenes. Kind of like a comic book. The first panel shows a spaceship with nine children standing in front of it. Their faces are drawn with detail, and I’m able to pick myself out immediately. The sight of me as a toddler rocks me back on my heels.

‘Was this here when you first saw the cave?’ Crayton turns away from the wall to ask Eight.

‘Yes,’ he responds. ‘All of this was here, just as you see it now.’

‘Who could have done it?’ Marina asks, looking up and down the wall, her voice filled with awe.

‘I don’t know.’ Crayton stands with his hands on hips, examining the wall. It’s disconcerting to see him look so confused.

The next panel shows a dozen dark figures that I can only assume are Mogadorians. They hold swords and guns, and the figure in the middle is twice the size of the others. Setrákus Ra. The Mogs’ tiny eyes and straight mouths are so accurate, so lifelike, I feel shivers run down my back. My eyes move right, and the next scene shows a girl lying in a pool of blood. I compare her face to those in the first panel, and it’s obviously Number One. Number Two, also a girl but younger than One, is also down, under the foot of a Mogadorian. Dead. My stomach turns when I see Number Three, a boy, impaled by a sword in a jungle. The last panel in the top row shows Number Four running from two Mogadorian soldiers, jumping over a ray that’s been shot from one of their guns. I gasp involuntarily. In the background is a large building on fire.

‘Holy shit. That’s John’s school,’ I say, pointing to the last panel.

‘What is?’ Marina asks.

I stab at the wall. ‘That fire at John’s school after we fought the Mogadorians. I was there! This is John’s school!’

‘Is that you in the sky, then?’

I look closer and see a small figure with long hair hovering over the school. ‘Okay, that is really freaky. Yes. I don’t understand. How did anyone –’