Ada is a quirky, seventeen-year-old senior trying to get through high school the only way she knows how - no drama, good grades, and lots of Shawarma, heavy on the garlic sauce. At least, that was the plan until she blacks out and starts seeing all sorts of disjointed visions.

Ada's world is thrown into total chaos - or a "polycrisis" as her and her best friend Didi call it - when she discovers that her visions are part of a larger cosmos (like, literally) of events. She is shocked to learn that, ever since her mother was pregnant with her, an oppressive regime called the First Rank from the world of Unitas has been hunting her. They want something from Ada: a source of power she never knew she was born with.

With the help of her ride-or-die, Didi; the enigmatic basketball star, Axel; the mysterious Winter, who is not all as she appears to be; and her all-time frenemy, Ellen, Ada must either take the fight straight to the First Rank or surrender her powers to save her loved ones.

But decisions have consequences. And Ada's ultimate decision will alter worlds and destinies.