3m-abbo-return-to-earth

Book 7 of the Two Worlds Epic

It is two centuries since a nuclear holocaust devastated the Earth. Friendly humanoid aliens, the Reptons, rescued one thousand human survivors and transported them to Tamacra, a Repton-inhabited world orbiting Tau Ceti. The small human colony thrived over the next ten generations as they integrated themselves into Repton society.

Meanwhile, Earth has returned to its former verdant glory and is now ripe for recolonization, Greg Diltwood and Lissa Doltgren are heavily involved in a decades-long effort to reseed the old home world. Their careful plans are suddenly disrupted when astronomers discover a rogue planet on a collision course with Tamacra. 

With only 400 days left to transfer 5 billion Reptons and hundreds of thousands of humans to Earth, they face a seemingly impossible task. Even the large Repton interstellar fleet is inadequate to the task. The most optimistic projections indicate there isn't enough time to save everyone. Greg and Lissa face hard choices, as well as mortal danger from the approaching rogue planet. What are they to do?