Checking behind me, I see I am no longer leaving wet footprints, and the gang, led by Jarrow Knight, don’t know which way I’ve gone. They stop in the doorway, and I can hear Mr Parker and some other teachers trying to restore order.

Cautiously, I open the door of the girls’ toilet.

A couple of minutes later, I’m dry, thanks to the hand dryer, and I have checked everything in the girls’ big bathroom mirror.

I truly am invisible again, every last inch of me. I’m working out my options when the bathroom door bursts open and smashes me in the face, hard.

I let out a howl of pain and collapse on the floor, clutching my face as three girls rush in. I crouch down, holding my nose, and I can’t see who’s saying what. The hardest thing is making sure I don’t moan in agony.

‘Oh, sorry, I didn’t … Hey? Did you hear that? What was that? Did you hit something? I heard someone … Jarrow, did you just scream?’

‘This is too freaky for me,’ says Jarrow.

I can feel the blood start to well up in my nose, and then it just bursts out. I remove my hands in time and jerk my head forward so that it doesn’t drip on my skin. Instead it forms a long crimson splatter, becoming visible as it hits the floor, a growing red pool seeping over the white-tiled floor. Even to me it looks very creepy, and I both know what it is, and am distracted by the agony in my face.

The one that’s called Gemma notices it first.

‘Oh, God. Jarrow, look. Blood!’

‘Eeugh! Where’s it coming from?’

I can’t even look up, because to look up would involve lifting my head and that would mean blood dripping down my face, so I’m stuck in this weird crouch. The pooling blood forms a little river through the spaces between the tiles and trickles towards their feet.

‘There’s more of it, Gemma. Oh, God. That’s gross. It looks like someone’s … eughh! I’m going to get Mrs McDonald.’

Two of them immediately leave the bathroom.

I can tell by her shoes that Jarrow is left behind. Her foot moves, tentatively kicking in my direction. She wants to see … what? I don’t know. But she’s getting too curious.

It worked with Aramynta Fell, so it might just work again.

I open my mouth and let out the throaty gargle again. With the blood gathering in my nose, it’s a more bubbly sound, and a fine spray of red with a few bigger globs land on Jarrow’s shoes.

That does it. She screams and runs out, stepping in the pool of my blood as she goes and leaving a red footprint on the tiles.

I can hear the sound system from the theatre playing some thumping house music, and a microphone crackling, and Mr Parker going, ‘Order! Come on, let’s have a little order.’

I’m just crouching and staying still, silently groaning as my nose throbs with pain and tears of agony sting my eyes.

That’s when the tingling starts in my skin, and the early headache.

It’s wearing off.

I’m going to be naked. In the middle of school.

Only, this time I’ll be totally, one hundred per cent, visible.