The Magic Circle by Barry Ryerson

Forty years ago, nuclear war devastated vast swathes of the world. Since then, the remaining countries strived to rebuild and grow stronger. Continents formed The Peace Accords, an agreement that cut all contact with each other to prevent such a war from ever happening again. Three strangers—an art student in Paris, a Russian spy, and a South African programmer—find their lives intertwine as magic returns to Earth. Guided by the mysterious Celestials, they must choose how they use this force in a fight that will determine the fate of every single living thing on the planet.

New Adult • Science Fiction/Military SF • Fantasy/Science Fantasy • Diversity Representation/LGBTQ+ • Diversity Representation/Disability • Science Fiction/Dystopian