“An exemplary sequel . . . superlatively crafted . . . Wilson has become a master at the integration of macro and micro story levels, which refract each other modestly and winningly.”—John Clute, SciFi.com
“Elaborates on strange new sciences and old dangers in an adventure solidly grounded in science. Intriguing characters and strong storytelling make this an excellent choice for most sf collections.”—Library Journal
“The sequel to Spin, Wilson's surpassingly strange yarn involves advanced alien Hypotheticals that, for reasons beyond speculation, moved Earth four-billion years into the future. Advanced biological techniques, including the means to prolong life by 30 years, were developed; those so treated became known as Fourths. And a huge space-warp Arch connects Earth to another habitable planet, Equatoria. Lise Adams comes to Equatoria to learn the fate of her father, Robert, a Fourth who vanished a decade ago. She hooks up with well-connected pilot and drifter Turk Findley, who asks old friend Tomas Ginn, another Fourth, about Robert. As an astonishing fall of ash from space, containing pieces of degenerating Hypothetical machines, coats the ground, Ginn vanishes. Lise learns that her ex-husband, Brian Gately, who works for the Department of Genomic Security, a sort of genetic CIA accountable to nobody, has had her followed. A second ash fall follows and grows into weird quasi-organic structures. Meanwhile, in an isolated desert community, Dr. Avram Dvali has performed a dangerous experiment, attempting to create a human capable of communicating with the Hypotheticals. The result is Isaac, a strange child with an odd affinity for the Hypothetical structures and an ability to detect something buried deep beneath the desert. As Lise loses her trust in Brian, and she and Turk try to evade capture by the DGS, Brian ponders photographs of Ginn's mutilated corpse and wonders what his superiors really want. This far-future odyssey, with its life-sized characters and unintelligible aliens, embellishes much while explaining little and ends up equally engrossing and exasperating.—Kirkus Reviews
“In this outstanding sequel to Wilson's Hugo-winning Spin, we are taken to the mysterious planet Equatoria, a world apparently engineered for humanity by the inscrutable machine intelligences known as the Hypotheticals. Turk Findley, a man with a criminal past, runs an aeronautical charter service on the newly settled planet. Lise Adams, who hires Turk, is a would-be journalist searching for her vanished father, a scientist obsessed with the Hypotheticals and their illegal life extension technology. Meanwhile, young Isaac, genetically manipulated by rogue scientists so that he may become a conduit between humanity and the AIs, is coming of age, and something enormous and unknown is assembling itself far underground. The various science and thriller plot elements are successful, but this is first and foremost a novel of character. Turk and Lise, who might well be played by Bogart and Bacall, are powerfully drawn protagonists, and their strong presence in the novel makes the wonders provided all the more satisfying."—Publishers Weekly (starred review)