(This book is a short story.) When scientists finally discovered the secret of consciousness – the C particle – they also discovered what the mystics had known all everything is conscious (in its own way). At least, those things that interact with the C particle. That includes pretty much all matter, anyway. And indeed, anti-matter, but that is of no importance, there being hardly any of the stuff around this part of the Universe. And, in theory, but noted by but a few, all dark matter... And as one person came to realise, it must therefore in theory be detectable – by consciousness. Ghosts. Yes, ghosts. Invisible people made entirely of invisible dark matter, from invisible dark matter worlds lit by invisible dark matter suns. Detectable by conscious beings but invisible to all other instruments except perhaps the most sensitive of gravity meters...