In 'Alien Earth', Robin Hobb explores a world where humanity has been altered by alien influences, leading to a complex interplay of cultures and species. The narrative delves into themes of identity, belonging, and the consequences of interstellar contact.

The story follows a group of characters navigating a transformed Earth, grappling with their new realities and the remnants of human civilization. As they encounter alien beings and technologies, they must confront their own humanity and the choices that define them.