I wrote this novella a couple of years ago at the behest of my friend Otto Penzler. The theme of 'vanishing' has stayed with me ever since, to the extent that I have, in Raymond Chandler's phrase, 'cannibalized' part of it for a sub-plot in the subsequent full-length Rebus novel, Dead Souls, while altering the histories of the characters involved so that both can be read independently.