After the events in Blue Remembered Earth, the stars are open to humanity. The mysterious alien artifact Mandala, on the planet Crucible twenty-eight light years away, becomes the destination for a swarm of huge spaceships constructed from hollowed-out asteroids. Chiku Akinya is the daughter of Sunday Akinya, one of the protagonists of the first book. She has undergone an unusual procedure, creating two clones of herself and implanting neural machines that synchronize memories. Chiku is three individuals, but also one through the shared memories. One copy, known as Chiku Red, departs to recover great-grandmother’s lost spaceship, fast leaving the vicinity of the Solar System. Another, Chiku Green, joins the asteroid ship exodus on its way to Crucible. The last, Chiku Yellow, remains on Earth. The latter two are the main protagonists. As the distance between Chiku Green and Chiku Yellow increases, so does the communication lag, and the story jumps decades forward in time to keep the rhythm, skipping seamlessly between the two to emulate their shared memories.
Even more than in the first book, the main theme is about the nature of intelligence. Can machine and organic intelligences co-exist? Another major theme is the nature of aging. As life extension is more and more perfected, senescence becomes a rare thing, to the point the withholding of anti-aging procedures is used as a punishment for one of the characters. How does this affect humans?
Unfortunately, this installment suffers from the same issues as the first book. The book seems overlong and the pace is ponderous. The story itself is not very powerful, serving more as a backdrop to a philosophical discussion.