I came up feeling horribly wet and sticky. There was blood smeared over my chest and I’d wet myself at some point, probably when she’d bitten me. I felt drained and voided and numb. I wanted to curl up and pretend that nothing was real.

‘That,’ I said, ‘is never going to catch on as a tool for historical research.’

Somebody was retching but amazingly it wasn’t me. Molly was hunched over, her face turned away and hidden by her hair, vomiting blood onto her nice clean tiles. My blood, I thought, and climbed to my feet. I was light-headed but I wasn’t falling over – that had to be a good sign. I took a step towards Molly to see if she was okay, but she flung her arm in my direction, palm out, and made violent pushing gestures, so I backed off.

I found myself sitting down again without any memory of wanting to. I was short of breath and I could feel my pulse racing in my throat – all symptoms of blood loss. I decided that it would be a good idea to have a little rest, and I lay back down on the cool tiles, all the better to maintain the blood flow to my brain. It’s surprising how comfortable a hard surface can be when you’re tired enough.

The rustle of silk made me turn my head. Molly, still crouching, had turned away from the slick pool of red vomit and inched towards me. Her head was tilted to one side and her lips were drawn back to reveal her teeth. I was just about to tell her that I was all right really, and didn’t need any help, when I realised that was probably not what she had in mind.

With a disturbingly spider-like motion Molly swung one arm over her head and down until her hand slapped on the tiles in front of her face. The arm tensed and dragged Molly another few centimetres towards me. I looked into her eyes and saw that they were all black, with no trace of white at all, and filled with hunger and despair.

‘Molly,’ I said, ‘I really don’t think this is a good idea.’

Her head tilted the other way and she made a gurgling, hissing sound, halfway between laughter and a sob. Sitting up gave me tunnel vision and dizziness, and I fought the urge to lie back down again.

‘You think you’re conflicted now,’ I said. ‘Just think how you’ll feel when Nightingale finds out you had me for dinner.’

Nightingale’s name made her pause, but only for a moment. Then her other hand swept over her head and slapped down right next to my leg. I snatched it away as best as I could and managed to gain a metre in separation.