The city is winched along tracks through a devastated land full of hostile tribes. Rails must be freshly laid ahead of the city and carefully removed in its wake. Rivers and mountains present nearly insurmountable challenges to the ingenuity of the city's engineers. But if the city does not move, it will fall farther and farther behind the "optimum" into the crushing gravitational field that has transformed life on Earth. The only alternative to progress is death.

The secret directorate that governs the city makes sure that its inhabitants know nothing of this. Raised in common in crèches, nurtured on synthetic food, prevented above all from venturing outside the closed circuit of the city, they are carefully sheltered from the dire necessities that have come to define human existence. And yet the city is in crisis. The people are growing restive, the population is dwindling, and the rulers know that, for all their efforts, slowly but surely the city is slipping...

The set up is just so incredibly tantalizing. A moving city. A twisted reality. A gradual reveal as our protagonist, who was raised in ignorance, slowly learns the truth of his world. It really is gripping stuff and pulled me right in, which was a welcome change from my recent grinding re-read of The Sprawl series.

What follows is, I hope, a relatively spoiler free review of the book. However, if you really want no hints–and given the book is a bit of a mystery box, with the joy in opening it and revealing its contents–it might be best to read the book before proceeding further!

Though I will say: I don’t understand why the ending is praised. Be ready for a fairly dull, exposition-laden finish and a very sudden ending that at first made me wonder if there was something wrong with my copy of the book.

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