The Secret Astronomers

A Novel in Notes

by Jessica Walker

Review posted February 26, 2026.
Viking, 2025. 304 pages.
Review written December 12, 2025, from a book sent to me by the publisher.
Starred Review
2026 Mathical Book Prize Honor Book, Grades 9-12

The Secret Astronomers is, as the subtitle tells us, a novel in notes. The book is a facsimile of an 1888 textbook on astronomy - which someone has started writing in, doing art over the pages, and putting post-it notes in.

At the front of the book we see a note taped in (the tape and note paper are in the image) with this written on it:

Find the oldest book in the Green Bank High School Library. Hidden inside are the secrets that are being left behind forever. If you're smart enough to figure out the message, then you have a right to know why a small town in the-middle-of-nowhere West Virginia is the center of intelligent life in the known universe.

We come to realize that the art and notes in the following pages are from a girl who's been forced to move to Green Bank to stay with her grandparents after her mother's death. The textbook everything's written over is the oldest book in Green Bank High School Library.

The writer complains about living in Green Bank, where the Internet is forbidden because of the radio telescopes, and talks about what it's like (with pictures) - when someone else joins the conversation, using Post-it notes instead of writing directly in the book. This new person begins with:

Hey would you PLEASE stop destroying this book? I know these pages are as old as Methuselah, but it's one of the only astronomy textbooks in our library and I need to reference it for my college application essay.

After that, the two get a conversation going. After some discussion and sharing about their lives, they decide to remain anonymous to each other. They call each other Copernicus and Kepler, and agree that they won't try to meet in person.

And then we learn about their lives and their Senior years in Green Bank. About their crushes and family drama. But they also slowly solve the puzzles and codes that Copernicus's mother left behind when she was a high school student in Green Bank, and that involves some clever twists.

Both want to get out of Green Bank - Copernicus to go back to San Francisco to be with her Dad, and Kepler to go to college (still worried about that application essay).

The art on the pages plus the hand-written notes do make this book an amazing reading experience. I'm glad our library doesn't have the eaudiobook, because this is one I'm glad I experienced visually.