The mutations are no more.

After barely surviving the events in Everwinter, Juno Quinn and her family are on their way home. But that doesn't mean all is right with the world. Refugees from Everwinter now flee to Eversummer, bringing together two races of people separated for over half a millennium. A clash of cultures is inevitable. But that's not what has Juno worried. Altair, the man she loves, claims to be a Forerunner, and that his people are returning...

But returning from where? And what are their intentions when they do?