From the same cryptic source as that supertechnology, filtered through a young girl's mind, comes the urgent message to make an interstellar trek to Hela, barren moon of the gas-giant Haldora. Hela is home to an obsessive religion fuelled partly by mind viruses and partly by the miracle of Haldora. This unpredictable, unbelievable event happens in an eyeblink, but more and more often. For the devout this increasing frequency is a signal of the End Times, which is why a group of vast mobile cathedrals lumbers forever around Hela--to keep Haldora at the zenith for best observation of its marvels. And on this last circuit, with a madman in command, the greatest cathedral of all plans an impossible short cut over the mysterious, delicate bridge spanning an immense rift in Hela's surface: Absolution Gap.

There's a lot of action with both familiar and enjoyably exotic weapons; there's suffering, deceit, loss and triumph; there's a hideous revenge straight out of Jacobean tragedy, a series of awesome revelations and the last voyage of the lightship Nostalgia for Infinity that was so strangely transformed in Revelation Space. Ultimately, behind the enigma of Haldora, a dreadful choice awaits: whether or not to bargain with powers that may be the answer to the Inhibitors--but may be something worse. Alastair Reynolds makes his huge story compellingly readable, with characters we care about, and gives impressive descriptions of beauty and cataclysm. This is very superior space opera. --David Langford