Aliens calling themselves Atoners appeared one day, built a base on the moon, and put an ad on the Internet. The ad said they had once wronged humanity. Now, to make such amends as they could, they were asking for human volunteers to visit other planets … see full wiki
A novel by Anthony Burgess
The first book in the "Twilight Saga" by Stephenie Meyer.
Mini-series of young adult novels by Ann Brashares