With huge thanks to Talya Baker, Mark Bould, Lauren Buckland, Mic Cheetham, Deanna Hoak, Simon Kavanagh, Peter Lavery, Claudia Lightfoot, Tim Mak, Farah Mendlesohn, Jemima Miéville, David Moench, Jonathan Riddell of London’s Transport Museum, Max Schaefer, Chris Schluep, Jesse Soodalter, Harriet Wilson, Paul Witcover, and everyone at Del Rey and Macmillan.

As always, I’m indebted to too many writers to list, but particularly important to this book are Joan Aiken, Clive Barker, Lewis Carroll, Michael de Larrabeiti, Tanith Lee, Walter Moers, and Beatrix Potter. Particular thanks are due Neil Gaiman, for generous encouragement and for his indispensable contributions to London phantasmagoria, especially Neverwhere.