Ryland Grace wakes up alone on a spaceship with no memory of why he's there. As his memory returns in fragments, he realizes he's humanity's last hope — sent on a suicide mission to save Earth from an organism consuming the sun. What follows is the best science fiction novel of the decade, with a friendship at its center that readers are still talking about.
Who it's for
Readers who want science fiction that treats the science as a feature, not a bug
Anyone who loved The Martian and wants Weir at his most ambitious
Readers who want genuine optimism and warmth in their sci-fi
Editor's take
Project Hail Mary has one of the great first acts in modern science fiction: a protagonist waking up alone, piecing together the situation, and taking us with him through discovery. The science — astrophysics, chemistry, biology — is accurate enough to be educational and explained well enough to never slow the story.
The friendship that develops in the second half of the book is what elevates it. It is one of the most emotionally resonant relationships in recent science fiction, full stop. The ending will stay with you. If you read one sci-fi novel this year, make it this one.
Who this is NOT for
Readers who want strong character drama over puzzle-solving — this is primarily a science problem novel
Anyone who needs stakes explained early — the full picture of what's happening takes a long time to assemble
Readers looking for a rich cast — this is essentially a two-character story for much of its length
Emotional payoff
Project Hail Mary delivers one of the most discussed endings in recent science fiction — genuinely surprising and emotionally earned despite the book's puzzle-box structure. The Ryland and Rocky friendship is the heart of it, and Weir times the payoff with unusual care. Readers who finish it consistently report an immediate desire to force it on someone they know.
Does Project Hail Mary need to be read after The Martian?
No — it is completely standalone with no connection to The Martian. You can read either first. If you haven't read The Martian, Project Hail Mary is the better starting point for new Weir readers.
Is Project Hail Mary hard science fiction?
Yes, but accessible. Weir explains the science through Ryland's internal monologue in a way that is clear and engaging rather than technical. Readers with no science background report loving it; readers with science backgrounds enjoy the accuracy.
Is Project Hail Mary being made into a film?
Yes — Ryan Gosling is attached to star in an MGM adaptation. No confirmed release date as of 2026.