In her breathtaking debut—part space odyssey, part sapphic rom-com—Emily Hamilton weaves a suspenseful, charming, and irresistibly joyous tale of fierce friendship, improbable love, and wonder as vast as the universe itself.

So, here’s the thing: Cleo and her friends really, truly didn’t mean to steal this spaceship.

They just wanted to know why, twenty years ago, the entire Providence crew vanished without a trace. But then the stupid dark matter engine started all on its own, and no...