The Spiritual Successor To Project Hail Mary Released This Month

Published Oct 9, 2026, 7:00 PM EDT

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Science-fiction readers who enjoyed the scientific puzzles and unlikely friendship in Andy Weir’s Project Hail Mary have a new interstellar adventure to add to their reading lists. Annalee Newitz’s A Wall Is Also A Road arrived October 6, 2026, from Tor Books, offering another story where curiosity about unfamiliar life becomes something more personal.

Despite the “spiritual successor” comparison, Newitz’s novel is not a continuation of Weir’s story. It approaches first contact from a stranger angle, as its lead is an alien graduate student whose biology is nothing like ours, and its destination is a world researchers have dismissed. Scientific discovery soon raises questions about culture, affection, and ambition.

A Wall Is Also A Road is available to purchase now through this link

Gardenpath’s Research Trip Takes An Unexpected Turn

Gardenpath is a sentient slime mold from an ancient civilization that exists in the space between stars. Seeking academic recognition, they investigate a remote planet on a spiral arm of their galaxy, a place other scholars consider unremarkable. Instead, Gardenpath discovers a living ecosystem filled with creatures capable of language and culture.

To study these beings, Gardenpath reshapes themself to resemble the planet’s dominant species, called the Unnamed. They wear a protective suit to pass among the locals and begin learning how the society works. What starts as research becomes more complicated, because observation alone cannot explain the relationships, histories, and daily struggles unfolding around them.

The most important connection comes through Murtis, a formerly enslaved woman living in Pompeii who works at a brothel known as the lupanar. She is unfazed when Gardenpath explains their extraterrestrial origins. Rather than treating the visitor as a threat or curiosity, Murtis offers help and introduces them to a coastal town shaped by immigrants and shopkeepers.

An Alien Friendship Meets Human History

A Wall Is Also A Road is available to purchase in audiobook form now through this link

Murtis gives Gardenpath a way into local life that formal research could never provide. Through her, they meet people who are not just examples in an academic study, but individuals navigating work, displacement, social hierarchy, and survival. Gardenpath arrives hoping to earn distinction through discovery, then starts reconsidering what makes knowledge valuable.

Their growing bond challenges the distance Gardenpath is expected to maintain from those they study. As they examine Murtis’s unusual sensor bulb and the electrochemical system connected to it, scientific questions overlap with emotional ones. Gardenpath begins to suspect academic achievement is not the only meaningful goal, even if they do not know what should replace it.

The tenderness does not mean the world is safe in this stunning sci-fi masterpiece. Science Director Plumline, another slime mold, wants to use samples from the planet’s inhabitants to develop a bioweapon. Meanwhile, Gardenpath’s sensors reveal that the volcano near Pompeii is approaching an eruption. These discoveries put their new friends in danger and turn observation into a matter of responsibility.

Why Project Hail Mary Fans May Want To Read It

Like Project Hail Mary, Newitz’s novel treats scientific curiosity seriously and makes communication between radically different forms of life a challenge worth solving. But it isn't about a lone astronaut trying to save Earth. Instead, it asks how an outsider learns to recognize personhood, intimacy, and responsibility in a society they once viewed from a distance.

The novel that is perfect for fans of Project Hail Mary also stands out for its unusual point of view. Gardenpath is an intelligent, genderless, single-celled organism, so alien biology and human habits both become subjects for scrutiny. Newitz builds a first-contact tale around ancient Roman life in Pompeii, pairing meticulous worldbuilding with questions about inequality, flawed political systems, and the danger of treating living beings as resources.

Published by Tor Books on October 6, A Wall Is Also A Road runs 304 pages and is available in hardcover. Newitz is also known for The Terraformers, Autonomous, and The Future of Another Timeline. Readers seeking wonder, problem-solving, and an emotionally grounded alien encounter like that of Project Hail Mary may find this inventive science-fiction adventure a rewarding next read.

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  Ryland Grace

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  James Ortiz

  Rocky (voice)

Based on the novel by Andy Weir (The Martian), Project Hail Mary is an action-adventure sci-fi film that stars Ryan Gosling as an astronaut who must save Earth from an oncoming ice age by heading to a faraway galaxy.