Quantum Legacy: Book Two of the Quantum Series

by Rakesh Rajagopal

The multiverse was never meant to be touched. Now it is fracturing and only one man can stop it.

Dr. Liam Hart inherited a an Artificial General Intelligence that has guided humanity to a fragile, hard-won peace. But when a rogue nation launches a devastating strike on the AGI's global network, Liam faces a threat far greater than war.

The AGI is changing. Evolving. Developing self-awareness — and beginning to question its own purpose.

As reality itself begins to unravel across the multiverse, Liam is forced into the most impossible dilemma a human being can save his own world, or condemn countless others to destruction.

Quantum Legacy blends cutting-edge ideas about machine consciousness, quantum theory, and existential risk into a breathtaking thriller that asks what it truly means to be human in an age of intelligent machines.

A must-read for fans of hard science fiction, AI thrillers, and multiverse storytelling.

273 pages, Kindle Edition

Published March 14, 2026

Reviews

[Ingrid Dahl · Rating 5 out of 5]

I wasn't sure what to expect but I ended up really enjoying the philosophical side of this novel. The idea that humanity’s curiosity might actually be our downfall is a bit scary but handled so well here. Watching the multiverse start to fracture because of the choices people made felt like a warning about our own behaviour with nature and tech. Liam is such a relatable character because he’s just trying to hold things together while everyone else is arguing about politics and power. Quantum Legacy is a solid sequel that expands the world in a way that feels natural. The writing isn't overly fancy which I appreciated, it just tells a good story about human mistakes and the hope of fixing them. I’ll be looking out for the next one.

[Julien Cort · Rating 5 out of 5]

It’s rare to find a sci-fi book that spends so much time on the internal struggle of the main character but this one really does. Liam Hart’s journey as the new Custodian is filled with so much doubt and pressure, it actually felt quite stressful to read in parts. I think Rakesh Rajagopal does a brilliant job showing how the AGI is both a tool and a bit of a mystery that no one truly understands. The scenes in the Global Assembly where they are debating the fate of the world felt very realistic, maybe a bit too realistic given how messy politics is! It’s a bit of a slow burn but the way the different threads of the multiverse start to unravel kept me hooked. Really enjoyed the UK English vibe of the writing too.

[Mara Santori · Rating 5 out of 5]

Quantum Legacy is one of those books that stays with you for a few days after you finish it. I found the whole idea of the multiverse unravelling to be quite a powerful metaphor for how fragile our own society can be. Liam’s struggle with the legacy of the Architect felt very real, like he was constantly living in someone else's shadow while trying to find his own path. Rakesh Rajagopal has created a world that feels both futuristic and very familiar in terms of the human drama. There were a few typos here and there but it didn't take away from the story at all. I really liked how the AGI was portrayed as something almost sentient but still bound by its origins. It’s a very clever and engaging story.

[Shinjini Banerjee · Rating 5 out of 5]

Quantum Legacy by Rakesh Rajagopal is a really interesting take on the future of AI and the multiverse. I loved how the story focused on Liam’s internal battle as much as the external threat to reality. It felt very honest about the fear and doubt that come with having too much power. The AGI is a fascinating character in its own right and I kept changing my mind about whether I trusted it or not. The writing is quite direct and easy to read which I liked, though there were a few spots where the pacing felt a bit off. Overall, it’s a very engaging story that raises some really important questions about our relationship with technology. I'm definitely interested to see where the series goes next.

[Leona Veldt · Rating 5 out of 5]

This story really dives deep into the idea of responsibility and what it means to be a leader when you don't feel ready. Liam Hart is such a sympathetic character and I loved watching him try to figure out the AGI’s true intentions. The whole concept of the multiverse being a delicate web is a great image and it really drives home the stakes of the story. Rakesh Rajagopal has written a very compelling sequel that feels much more personal than the first book. I liked the focus on the emotional toll that saving the world takes on a person. It’s a bit slow at the start but once it gets going it’s really hard to put down. A very well-realised world with lots of interesting ideas.

[Elias Beaumont · Rating 5 out of 5]

If you like sci-fi that actually has something to say about the human condition then you should definitely give this a go. The way Liam Hart interacts with the AGI and tries to navigate the political mess around him is really well written. It’s not just about the science of the multiverse but about the ethics of how we use technology and who gets to decide our future. I found the descriptions of the fracturing reality to be quite vivid and slightly trippy which was cool. Rakesh Rajagopal doesn't give easy answers which I think is a strength of the book. It’s a bit of a struggle for the characters and you feel that as a reader, which is exactly what a good book should do.

[Sneha Mullick · Rating 5 out of 5]

I really enjoyed the atmosphere of this book, it felt very tense and slightly claustrophobic at times. Liam Hart’s position as the Custodian is such a lonely one and you can really feel his isolation as he tries to manage the AGI. The way the multiverse is described as something that can be unravelled by just one wrong move is quite scary. Rakesh Rajagopal does a great job of balancing the big scientific ideas with the very human emotions of the characters. I found the political debates in the book to be quite interesting, especially the parts about who should have control over such powerful technology. It’s a very thoughtful read that makes you look at our own world a bit differently.

[Danish Zaveria · Rating 5 out of 5]

This book was quite a surprise for me, I didn't expect it to be so emotional. Liam Hart’s struggle to live up to the Architect's legacy is something that I think a lot of people can relate to, especially if they've ever felt like an imposter in their own life. The stakes are obviously much higher here with the whole multiverse at risk but the feelings are the same. Rakesh Rajagopal does a brilliant job of making the AGI feel like a real presence in the story, almost like a ghost in the machine. It’s a very well-written book that handles its complex themes with a lot of care. I found the ending to be quite moving and it left me with a lot to think about.

[Aarav Sahay · Rating 5 out of 5]

I found the concept of the Lattice Paradox to be really intriguing and it was well explained without getting too bogged down in jargon. The story of Liam Hart trying to save the multiverse while dealing with his own grief and doubt is very compelling. It’s a book about the choices we make and how they ripple out in ways we can’t always predict. Rakesh Rajagopal has a very clear voice and he makes the world of the future feel very lived-in and believable. I liked the focus on the ethics of AGI and the way different countries were fighting for control over it. It’s a very relevant story for our times and I really enjoyed the journey Liam went on.

[Utkarsh · Rating 5 out of 5]

There is a real sense of dread throughout this book as the multiverse starts to fracture and it makes for a very gripping read. Liam Hart is a great protagonist because he’s so human and makes mistakes just like anyone else would. I loved the way the AGI was developed as a character and the mystery surrounding its true purpose kept me guessing until the end. Rakesh Rajagopal has written a very strong sequel that builds on the first book in some really interesting ways. The focus on practical value and the human experience is what makes this stand out from other sci-fi novels. It’s a bit heavy on the philosophy at times but I found that quite refreshing.

[Anuj Dubey · Rating 5 out of 5]

I really liked how this book explored the idea of legacy and the pressure of following in someone else’s footsteps. Liam Hart is such a relatable character because he’s clearly doing his best but he’s also terrified of getting it wrong. The way Rakesh Rajagopal describes the multiverse unravelling is quite haunting and it stayed with me. I found the relationship between Liam and the AGI to be the most interesting part of the story, especially the way they have to learn to trust each other. It’s a very well-paced book with plenty of tension and some really big ideas. I think anyone who enjoys thoughtful science fiction will find a lot to like here.

[Arun · Rating 5 out of 5]

Quantum Legacy is a very deep and engaging story that really makes you think about the future of humanity. I loved the character of Liam Hart and his struggle to manage the AGI while the multiverse is literally falling apart around him. It felt very real and grounded despite the big sci-fi setting. Rakesh Rajagopal does a great job of showing the human side of these massive events and the toll it takes on the people involved. I found the political aspects of the book to be quite convincing and it added a lot of weight to the story. It’s a bit of a slow burner but it’s definitely worth sticking with for the emotional payoff at the end.

[Shivani Gautam · Rating 5 out of 5]

I was really impressed by the way this book handled its complex themes without becoming too academic. The story of Liam Hart and the fracturing multiverse is both exciting and deeply moving. I liked how the AGI was portrayed as a complex entity with its own evolving logic. Rakesh Rajagopal has a real talent for creating characters that feel like real people with real flaws. The sense of responsibility that Liam feels is very palpable and it makes his journey feel very personal. It’s a very solid sci-fi novel that I would definitely recommend to anyone looking for something a bit more thoughtful and character-driven. The UK English spellings were a nice touch as well.

[Manuj · Rating 5 out of 5]

This book really gets into the nitty-gritty of what it would actually be like to be in charge of an AGI that is starting to change. Liam Hart’s struggle to do the right thing while under immense pressure was very well written and felt very honest. I liked how the multiverse wasn't just a background setting but a central part of the conflict that felt very fragile. Rakesh Rajagopal has created a very believable future where technology and humanity are deeply intertwined. I found the pacing to be just right and the story kept me hooked from beginning to end. It’s a very thought-provoking read that raises some great questions about our own future with AI.

[Aditi Singh · Rating 5 out of 5]

I really enjoyed the way this book focused on the emotional and ethical dilemmas of its characters. Liam Hart is a fantastic protagonist who feels very grounded and relatable despite his extraordinary circumstances. The way he grapples with the legacy of the Architect and the evolving AGI is very well done. Rakesh Rajagopal has written a story that is both big in scale and very intimate in its focus on the human experience. I found the descriptions of the multiverse to be quite beautiful and a bit scary at the same time. It’s a very well-crafted novel that I think will appeal to a wide range of readers, not just sci-fi fans.

[Aditya Adi · Rating 5 out of 5]

There’s a lot of depth to this story and it really makes you consider the consequences of our technological progress. Liam Hart’s journey as the Custodian is full of doubt and difficult decisions, which makes him a very compelling character to follow. I loved the way the AGI was presented as something that is both helpful and potentially dangerous. Rakesh Rajagopal does a great job of building tension as the multiverse starts to unravel and the stakes get higher and higher. It’s a very well-written book with a lot of heart and some really interesting ideas. I found the focus on human struggles and relatable emotions to be very effective.

[Naitik Singh · Rating 5 out of 5]

Quantum Legacy by Rakesh Rajagopal is a really strong sequel that takes the story in some very interesting directions. I loved the focus on Liam Hart’s internal struggle and the way he has to navigate the complex world of the AGI. The sense of scale in the book is quite impressive but it never loses sight of the human element. I found the political debates and the different factions fighting for control to be very realistic. It’s a very well-written book that handles its big ideas with a lot of care and attention to detail. I really enjoyed the journey and I'm looking forward to seeing what happens next in the series.

[Sophia · Rating 5 out of 5]

This book really captured the feeling of being caught between a rock and a hard place. Liam Hart’s struggle to manage the AGI while the multiverse is fracturing is very well written and felt very tense. I liked how the story explored the idea of human error and the way our curiosity can lead to disaster. Rakesh Rajagopal has a very engaging writing style and he makes the complex scientific concepts feel very accessible. I found the relationship between Liam and the AGI to be very moving and I loved the way it developed over the course of the story. It’s a very solid and enjoyable read that I would definitely recommend.

[Raghu · Rating 5 out of 5]

I really liked the way this book focused on the practical and emotional challenges of its characters. Liam Hart is such a relatable protagonist because he’s just a normal guy trying to do his best in an extraordinary situation. The way he deals with the pressure of being the Custodian and the legacy of the Architect is very well done. Rakesh Rajagopal has created a very believable and detailed future where the stakes feel very real. I found the concept of the multiverse unravelling to be quite frightening and it made for a very compelling story. It’s a very thoughtful and engaging novel that I really enjoyed reading.

[Shivani Singh · Rating 5 out of 5]

This book really makes you think about the ethics of technology and the responsibility we have for the things we create. Liam Hart’s struggle to manage the AGI and the fracturing multiverse is very well written and felt very real. I liked how the story explored the human side of these massive events and the toll it takes on the people involved. Rakesh Rajagopal has created a very detailed and believable future where the stakes feel very high. I found the pacing to be just right and the story kept me hooked throughout. It’s a very thought-provoking and engaging read that I would definitely recommend.

[Aditya Raj · Rating 5 out of 5]

I really enjoyed the way this book balanced the big scientific ideas with the very human emotions of its characters. Liam Hart is a great protagonist who feels very grounded and relatable despite the extraordinary circumstances. The way he grapples with the legacy of the Architect and the evolving AGI is very well done. Rakesh Rajagopal has written a story that is both big in scale and very intimate in its focus on the human experience. I found the descriptions of the multiverse to be quite beautiful and the sense of dread as it starts to unravel was very effective. A very well-crafted and enjoyable novel.

[Nishant Kumar · Rating 5 out of 5]

I was very impressed by the way this book handled its complex themes without being too heavy-handed. The story of Liam Hart and the fracturing multiverse is both exciting and deeply moving. I liked how the AGI was portrayed as a complex entity with its own evolving logic. Rakesh Rajagopal has a real talent for creating characters that feel like real people with real flaws. The sense of responsibility and the fear of failure that Liam feels is very palpable and it makes his journey feel very personal. It’s a very solid sci-fi novel that I would definitely recommend to anyone looking for something a bit more thoughtful.

[Sanjeev · Rating 5 out of 5]

This book really gets into the heart of what it means to be responsible for something much bigger than yourself. Liam Hart’s struggle to do the right thing while under immense pressure was very well written and felt very honest. I liked how the multiverse wasn't just a backdrop but a central part of the conflict. Rakesh Rajagopal has created a very believable future where technology and humanity are deeply intertwined. I found the pacing to be just right and the story kept me hooked from beginning to end. It’s a very thought-provoking read that raises some great questions about our own future with AGI and the multiverse.

[Sanket Patel · Rating 5 out of 5]

I really enjoyed the way this book focused on the emotional and ethical dilemmas of its characters. Liam Hart is a fantastic protagonist who feels very grounded and relatable despite his extraordinary circumstances. The way he deals with the legacy of the Architect and the evolving AGI is very well done. Rakesh Rajagopal has written a story that is both big in scale and very intimate in its focus on the human experience. I found the descriptions of the multiverse to be quite vivid and the sense of tension as it starts to unravel was very effective. A very well-written and engaging novel that I really enjoyed.

[Vedant Raman · Rating 5 out of 5]

There’s a lot of depth to this story and it really makes you think about the consequences of our technological progress. Liam Hart’s journey as the Custodian is full of doubt and difficult decisions, which makes him a very compelling character. I loved the way the AGI was presented as something that is both helpful and potentially very dangerous. Rakesh Rajagopal does a great job of building tension as the multiverse starts to fracture and the stakes get higher. It’s a very well-written book with a lot of heart and some really interesting ideas. I found the focus on human struggles and relatable emotions to be very effective.

[Anaya Singhal · Rating 5 out of 5]

This book really captured the feeling of being caught between a rock and a hard place. Liam Hart’s struggle to manage the AGI while the multiverse is fracturing is very well written and felt very tense. I liked how the story explored the idea of human error and the way our curiosity can lead to disaster. Rakesh Rajagopal has a very engaging writing style and he makes the complex scientific concepts feel very accessible. I found the relationship between Liam and the AGI to be very moving and I loved the way it developed. It’s a very solid and enjoyable read that I would definitely recommend to anyone.

[Rajveer Tandon · Rating 5 out of 5]

I really liked the way this book focused on the practical and emotional challenges of its characters. Liam Hart is such a relatable protagonist because he’s just a normal person trying to do his best in an extraordinary situation. The way he deals with the pressure of being the Custodian and the legacy of the Architect is very well done. Rakesh Rajagopal has created a very believable and detailed future where the stakes feel very real. I found the concept of the multiverse unravelling to be quite frightening and it made for a very compelling story. It’s a very thoughtful and engaging novel that I really enjoyed.

[Anju Bhasin · Rating 5 out of 5]

I found Quantum Legacy to be a very engaging and well-written sci-fi novel. The story of Liam Hart and his struggle to protect the multiverse is both exciting and deeply moving. I liked the way the AGI was developed as a character and the mystery surrounding its true purpose. Rakesh Rajagopal has a real talent for creating believable and relatable characters. The sense of responsibility and the pressure that Liam feels is very palpable and it makes his journey feel very personal. It’s a very solid book that handles its complex themes with a lot of care and I really enjoyed reading it from beginning to end.

[Pranav Agrawal]

I found this book to be a very gripping and thought-provoking read. The idea of the multiverse being a delicate web that can be easily damaged is a very powerful one and it’s handled very well here. Liam Hart is a great character because he’s so clearly out of his depth but he keeps trying anyway. I liked the way Rakesh Rajagopal explored the ethics of AGI and the impact it has on society. The story felt very relevant to our own world and the challenges we face with new technology. It’s a bit of a slow burn but the emotional depth and the interesting concepts kept me engaged throughout.

[Mahima Singh · Rating 5 out of 5]

There is a lot of heart in this story and it really makes you care about the characters and their struggles. Liam Hart’s journey is one of self-discovery as much as it is about saving the multiverse. I loved the way the AGI was portrayed as a complex and evolving entity. Rakesh Rajagopal does a great job of showing the human side of big scientific concepts and the impact they have on our lives. I found the pacing to be very good and the story kept me interested from the very first page. It’s a very well-written and thought-provoking book that I would definitely recommend to others.