The Rains / Gregg Hurwitz.

In one terrifying night, the peaceful community of Creek’s Cause turns into a war zone. Chance Rain, his older brother Patrick, and their closest friend, Alexandra, find themselves fighting off multiple attacks from infected adults, while other young survivors hide at the high school. Most of the kids they know have been dragged away by once-trusted adults who are now ferocious, inhuman beings. The parasite that transformed them takes hold after people turn eighteen—and Patrick’s birthday is only a few weeks away. Determined to save Patrick’s life and the lives of the remaining kids and teens, the brothers embark on a mission to uncover the truth about the parasites—and what they find will change everything.

For young adults.