The battle for supremacy between the human race and the Netvor, a race of augmented clones built solely to annihilate humankind, rages on. The Netvor have gained an edge thanks to their new technology, which helps them cloak their warships as they destroy human battleships and lay waste to the human outposts spread across the galaxy. Matters take a curious turn when Captain Aiden Macallan and the crew of the Sun Wolf encounter Jo, a supposedly defective Netvor clone who feels that her goals are more aligned with the humans than with her makers. Jo has vital information that can turn the tide of the war, and Aiden is hellbent on risking everything to get it. He will have to battle the Netvor and other insidious threats to succeed in David C. Jeffrey's Qarsoon.

Qarsoon is the latest installment in David C. Jeffrey's Space Unbound series. Aiden's references to critical events in his past, combined with brief synopses of the previous three instalments, make it easy for new readers to follow the overall plot while keeping avid followers invested in the series. Science fiction purists will enjoy dialogue that is rich in details of how the futuristic technologies function. Factor in the rapid pace, the extensive glossary at the end, and the intense, strategy-oriented battles that highlight key moments in Aiden's odyssey, and you get an immersive adventure that will captivate action and drama enthusiasts as well. I enjoyed reading this captivating novel and cannot wait for the next installment of a genre-defining masterpiece.

Qarsoon by David C. Jeffrey, book four of the sweeping Space Unbound series, begins in the year 2223, when Captain Aiden Macallan finds a dead man outside his home on Luna and discovers that the killing is tied to a secret message from his wife, Dr. Skye Landen. The message points to the Libera, a concealed civilization created by a failed Netvor transformation with technology beyond human defenses. As the Netvor begins erasing colonies and threatens Earth with a gamma weapon, Aiden takes the Sun Wolf into restricted space to locate the Libera before time runs out. His mission collapses when a trusted officer seizes control and turns the crisis into an internal siege. With Earth facing annihilation, Aiden must choose whom to trust as political pressure, covert warfare, and divisions converge in deep space.

David C. Jeffrey’s Qarsoon is an absolutely brilliant, far-future space epic. The title links to a rogue world whose name translates as hidden, applying both to its literal concealment and the planet. The author is excellent when it comes to the story's tech, giving readers rigorously imagined spaceflight systems that feel operational, such as the capability to detect cloaked ships through gravitational microlensing signatures. This is intelligent entertainment, and it will tick all the boxes of even the pickiest science fiction aficionados. Aiden Macallan is a protagonist we want to root for. The settings are gorgeous, particularly during Qarsoon’s star-rise, where a distant binary sun crests the horizon, rendering the planet alien yet inhabited. Overall, this book is perfect for those who enjoy strategic space drama, ethically charged command decisions, and readers drawn to hard-science frameworks and expansive interstellar politics.