Ultima

Hailed as “one of the most inventive writers that science fiction has ever produced” (SF Site), Stephen Baxter builds on the massive success of Proxima with a career-defining novel of big ideas....

On the planet of Per Ardua, alien artifacts were discovered—hatches that allowed humans to step across light-years of space as if they were stepping into another room. But this newfound freedom has consequences....

As humanity discovers the real nature of the universe, a terrifying truth comes to...