Coming out is hard, especially when you have two gay moms. At least it is for Simon Bugg. He doesn't want the world to think that having gay parents has turned him gay. And he certainly doesn't want anyone to know about the alien in his stomach that's trying to kill him. It's Simon's senior year and his world just turned upside down. When his mom scores a dream job, Simon lands at a new school away from the only friends he has ever known. Now, his mom is overworked and chronically stressed, and his deadbeat dad is back on the scene. Navigating a new school and new friends is a challenge for a neurotic overthinker, and Simon finds himself turning to his rescue cat and a local barista for support. But when Simon meets the handsome PJ in drama class, he gets talked into a date that he derails in spectacular fashion. With a little help from his friends-new and old-Simon finds his way back to PJ. But how can he have a real relationship with the boy of his dreams when he's convinced he's going to die? No one knows about the nightly alien attacks at 11:22. Why then, and why do they keep getting worse? Simon must face a dark secret inside before he loses his chance with the boy he loves.