The ship's AI, an intelligent and witty system named ART (Artificial Reasoning Tool), guides Ryland through his journey. Together, they embark on a perilous quest to find a solution to an mysterious threat to the universe.

Andy Weir's writing style in "Project Hail Mary" is engaging, humorous, and thought-provoking. The novel explores themes of existentialism, artificial intelligence, and human resilience. Weir's expertise in science and engineering shines through in the book's accurate and detailed depiction of space travel and astrobiology.

The story follows Ryland Grace, a man who wakes up on a spaceship called the "Hail Mary" with no memory of who he is or how he got there. As he tries to piece together his past, he discovers that he is on a mission to save humanity from an existential threat.