One of science fiction's greatest meditations on extended human lifespan, the limitations of human memory, and the haunted confabulations that go with forgetting.
On the North Pole of Pluto there stands an enigma: a huge circle of standing blocks of ice, built on the pattern of Earth’s Stonehenge―but ten times the size, standing alone at the edge of the Solar System. What is it? Who could have built it?
The secret lies in the chaotic decades of the Martian Revolution, in the lost memories of those who have lived for centuries.