Tor Essentials presents new editions of science fiction and fantasy titles of proven merit and lasting value, each volume introduced by an appropriate literary figure.

Decades before his massively successful The Ministry for the Future (2020), Kim Stanley Robinson wrote one of SF'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.

This new Tor Essentials edition of Icehenge includes a new introduction by Henry Farrell, co-author of Underground Empire: How America Weaponized the World Economy.