In Cosmic Conundrum, sixth grader Serafina Sterling finds herself accepted into the Ivy League of space adventures for commercial astronauts, where she'll study with Jeronimo Musgrave, a famous and flamboyant scientist who brought jet-engine minivans to the suburbs. Unfortunately, Serafina also meets Ida Hammer, a 12-year-old superstar of science who has her own theorem, a Nobel-Prize-winning mother, impeccable fashion sense—and a million social media followers. Basically, she's everything Serafina's not. Or so Serafina thinks.

Even in an anti-gravity chamber, Serafina realizes surviving junior astronaut training will take more than just a thorough understanding of Newton's Laws. She'll have to conquer her fear of public speaking, stick to the rules, and overcome the antics of Ida. How will Serafina survive this cosmic conundrum?