She wants a sign to tell her when the right day comes. She knows she won’t get one, not for this; maybe not for anything after this, ever again.

She makes her own. When she hears the Daleks talking about OMG this stupid project taking forever have to go up on Tuesday evening so booooring, Holly says, at the end of art class, ‘Study time again on Tuesday?’ Watches the others nod, while they pour drifts of powdered chalk into the bin and coil copper wire away.

She is meticulous. She makes sure to chatter the others past the Secret Place, on their way into the art room and out again, so none of them see what isn’t there. Makes sure to leave her phone out of sight, on a chair pushed under the table, so no one spots it for her. Makes sure to say, ‘Oh, pants, my phone!’ after lights-out. Makes sure to run through every step, the next morning, up in the empty corridor: pin it, see it (quick gasp, hand to her mouth, like someone’s watching), get the envelope and the balsa knife, lever out the thumbtack as delicately as if there might actually be fingerprints there. When she runs back down the corridor, the sound of each footstep flies up into a high corner, slaps onto the wall like a dark handprint.

The others believe her when she says she has a migraine – she’s had three in the past two months, matching Mum’s symptoms. Julia pulls out her iPod, to keep Holly from getting bored. Holly lies in bed and watches them leave for school like it’s the last time she’ll ever see them: already half gone, Becca flipping through pages for her Media Studies homework, Julia hauling at a sock, Selena tipping a smile and a wave over her shoulder. When the door slams behind them, there’s a minute when she thinks she’ll never be able to make herself sit up.

The nurse gives her migraine pills, tucks her in and leaves her to sleep it off. Holly moves fast. She knows what time the next bus into town leaves.

It hits her at the bus stop, in the cool-edged morning air. At first she thinks she actually is sick, that what she’s doing has called down some curse on her and now all her lies come true. She hasn’t felt it in so long and it tastes different now. It used to be vast and dark-bloody; this is metallic, this is alkaline, this is like scouring powder eating through your layers one by one. It’s fear. Holly is afraid.