Yesterday's Kin

Nebula Award Winner
Locus Award Winner
Aliens have landed in New York. After several months of no explanations, they finally reveal the reason for their arrival.
The news is not good.
Geneticist Marianne Jenner is having a career breakthrough, yet her family is tearing itself apart. Her children Elizabeth and Ryan constantly bicker, agreeing only that an alien conspiracy is in play. Her youngest, Noah, is addicted to a drug that keeps temporarily changing his identity. The Jenner family could not be further apart. But between the four of them, the course of human history will be forever altered.
Earth's most elite scientists have ten months to prevent a disaster—and not everyone is willing to wait.