The short verdict: Project Hail Mary is a big-hearted, very nerdy survival story, and yes, it's worth reading, whether you've seen the movie or not. If you love watching a character think their way out of trouble, it's a treat. If science on the page makes your eyes glaze, it will feel long.
This review is spoiler-free until you reach the clearly marked book vs movie section, and even that stays light.
What it's about (no spoilers)
Andy Weir's 2021 novel follows Ryland Grace, a science teacher and former molecular biologist. He wakes up alone on a spaceship with no memory of who he is or why he's there. His crewmates are dead. Slowly, his memories come back, and he learns he's on a last-chance mission to stop a threat to the Sun, and to life on Earth.
The story cuts between Grace on the ship and flashbacks on Earth as his memory returns. That structure is the engine of the book. You find out what's going on at the same pace he does.
If you've seen the trailer, you already know he isn't completely alone out there. That's as far as we'll go.
Why so many people are picking it up right now
The film adaptation, starring Ryan Gosling and directed by Phil Lord and Christopher Miller, hit US theaters on March 20, 2026. It was a big hit, grossing over $685 million worldwide, and in April 2026 the book was back at #1 on The New York Times fiction best-seller list, five years after it first came out.
The book was already a success before Hollywood got involved. It was a finalist for the 2022 Hugo Award for Best Novel, and both Bill Gates and Barack Obama put it on their 2021 reading lists.
What the book does really well
It makes problem-solving feel like suspense
Most thrillers build tension with villains or chases. Project Hail Mary builds it with questions. What is this thing? How do I test it? What happens if I'm wrong? The book works through a lot of real-feeling science to answer them, and the fun is in the reasoning.
Critics picked up on this too. Mary Robinette Kowal, reviewing it for The Washington Post, singled out Grace's infectious enthusiasm for science as one of the book's big strengths.
The friendship at its center
Without giving anything away, the emotional core of this book is a friendship, and it's the reason a lot of readers end up loving it. Kirkus called it "an unforgettable story of survival and the power of friendship," and gave it a starred review. It's a rare sci-fi novel where the big payoff is about loyalty rather than lasers.
The voice
Weir writes with a light, joking tone even when the stakes are the end of the world. A reviewer at Locus described the novel as "a celebration of Weir's voice." If you liked the jokey narration of The Martian, you'll recognize it here.
Where it stumbles
It isn't perfect, and even positive reviews said so.
- Some problems feel convenient. Kowal pointed out in The Washington Post that some of the trouble Grace gets into could have been avoided with common sense and the checklists real spaceflight relies on.
- It's one loop, start to finish. The book is built as a long chain of problem, experiment, solution. That's the appeal. If that loop doesn't grab you early, know that the rest of the book is more of it.
- It asks you to forgive a little. The New York Times review put it neatly: "For readers who can forgive its shortcomings, the result is an engaging space odyssey."
None of these sink it. They just tell you who it's for.
Book vs movie: which should you do first?
Light spoilers for the overall shape of the story, nothing about the ending.
The movie runs 156 minutes. According to Variety, the directors screened a nearly four-hour cut to other filmmakers and were told to make it much shorter. That tells you how much the story had to lose to fit on screen.
Here's what the book gives you that the film can't:
- Time inside the problems. The film has to move. The book can sit with Grace while he works something out, step by step. For a lot of readers, those pages are the whole point.
- A slower reveal. The book drip-feeds Grace's memories, including one big answer about why he's on the ship. With more room, that reveal has more weight.
- Your own version of the alien. On screen, Rocky is roughly half puppetry and half visual-effects animation. In the book, you build it in your head from Weir's descriptions, which is a very different experience.
What the film gives you: it looks spectacular, and critics loved it. At the time of writing, 95% of critics' reviews on Rotten Tomatoes are positive. Some critics even preferred it. Ryan Cooper at The American Prospect called it "one of the rare films that is quite a bit better than the book." Not everyone agreed. Owen Gleiberman at Variety called it "not a very good movie."
Our take: if you haven't seen the film yet, read the book first. The mystery of what's going on is the best part, and the book gives you more of it. If you've already seen the film, the book is still worth it, because it's built around the thinking that the movie had to skip.
Who should read it
Read it if:
- You liked The Martian (same author, same spirit).
- You enjoy puzzles, science, or stories about competence.
- You want a sci-fi novel with real warmth.
Maybe skip it if:
- You want literary prose.
- Long stretches of scientific reasoning sound like homework.
- You're after dark, serious sci-fi. This one is hopeful and often goofy.
A practical note: the hardcover runs 496 pages. It moves fast, but it's a real commitment.
If you liked it, try next
- The Martian by Andy Weir. The original stranded-scientist survival story.
- Artemis by Andy Weir. His 2017 novel, a heist story set in a city on the Moon.
Read the book first
A great movie makes you want to read the book. The hard part is actually getting through nearly 500 pages when your phone is right there. Read First is built for exactly that: reading before you scroll.