'The equivalent of London's brand-new Elizabeth line . . . vast, shiny and very, very deep' - The Times, 'Best Summer Reads'

'Utterly unique . . . A masterpiece' - The Daily Mail

'Stunning . . . Brilliantly original' - The Guardian

London is built from concrete, steel and the creative urge.

Old technology gives way to the new. Progress is inevitable - but is it more fragile than its inhabitants realise?

A strange anomaly is uncovered in the new top-secret Crossrail extension being built under Buckingham Palace. It is an archeological puzzle, one that may transform our understanding of history - and the origins of London itself.

And if our modern world falls, we may have to turn to the technology of the past in order to save our future.