Haunter Grey: Execution is the 10th book in the Last Ark series by Ross C. Miller. Over the course of nine books, Castor, amnesiac and Resistance leader, searches for Anselmi Taskinen amid a losing war. Gianna, former Unity Lord, battles to protect Regia’s people while Moriah, Trillian, and others share their histories. Castor and Gianna aim to seize Unity fleets, risking Haunter Grey’s destruction. President Hudson controls the Wilson Concurrence copy as Unity’s Prime orders extermination. Warnings from Shades about a Verucross delegation complicate Castor’s mission. His brain patterns match Rabid’s, and his memories link to Regia’s bulboar mines. Equipped with Unity cuffs and ghosting, his unleashed beast causes chaos while the Prophecy Response Team awaits. Now, after the capture and extraction of classified information, Unity destroyed Josephs' ships, upgraded its fleet to battle Castor and the Greys. Using his DNA, Unity cloned Castor, preparing his execution while the team continued pursuing the Adversary.

“'From everyone who has been given much, much will be demanded; and from the one who has been entrusted with much, much more will be asked.’ Luke 12:48...” Ross C. Miller’s Haunter Grey: Execution impresses once again with his expertly crafted world, and through thoughtful, advanced technology such as gate travel, AI support, and interplanetary communications for a believable sci-fi environment. I love the political and military factions, including the Resistance and Sylvani, and Miller’s skill shines in the portrayal of cloned characters, both old and new, and the coined phrase of the “Grimmerized Me-clone.” Hands down, the best elements are the combat scenes, with a standout climactic moment that throws us straight into Clarion’s quick thinking, and firing as a fast-paced, visceral experience, acting fast to save Castor. Overall, Miller knocks it out of the park, and this installment is a strong read for sci-fi enthusiasts and fans who appreciate the imagination and ingenuity of Miller's work. Very highly recommended.

The Unity are back with a vengeance. Genine searches for Castor on Aieea's shuttle and comes across the world of Eden, where Sarco City has been destroyed by rocks flung onto it. But a run-in with a Unity force has Aieea searching for a lost Genine instead. Meanwhile, Nahima addresses the Bethellian delegation. After losing his wives, Triilian and Moriah, Castor and the rest of the Greys search for the elusive Adversary, who, unbeknownst to them, has set a trap. Without Lessa and Tacomah, the Resistance, alongside their allies from the Prophecy Response Team, must find a way to take a stand against Castor's clone. Ross C Miller's Haunter Grey: Execution follows Castor and his allies as they take their fight against the Unity to its ultimate conclusion.

This is a great series for sci-fi/space opera lovers. Haunter Grey: Execution is a fitting end to the series. Author Ross C Miller is a master at crafting absorbing tales about good versus evil set in space, and this book is no exception. In this sprawling world-hopping tale, you will find courageous heroes who sacrifice themselves for the greater good, thrilling space battles that have you on the edge of your seat, as well as futuristic sci-fi concepts that push the boundaries of your imagination. The character work is stellar, and the plotting is as intricate and unpredictable as ever. Among the new factions, I had a soft spot for the Children of the Prophecy, Silvani. I also liked Castor's bond with Clarion. Anyone who enjoys epic space opera sagas will find this to be an engrossing read.

Execution is the tenth book in the Last Ark - Haunter Grey series by Ross C Miller. Following the devastating events of Prophecy, Castor and his team continue their desperate struggle against the Unity forces. After Resistance Commander Josephs is captured and executed along with his fleet, Castor becomes the next target. The Unity not only attempts to destroy him but also creates a Grimmerized clone using his DNA, a ruthless weapon engineered to lead Castor’s enemies closer to the final showdown. As Castor and the Prophecy Response Team close in on the mysterious Adversary, they are forced to confront this twisted mirror of their leader and a plan designed to wipe out the Resistance for good. Can they survive? Or is this the end of the road for them?

Packed with action and filled with intensity, Haunter Grey – Execution was a wonderful continuation of the series, and I enjoyed every second of it. I was sitting on the edge of my seat as I read page after page of this incredible science fiction story. Miller excels at building complex political and military tension while maintaining a strong emotional core through Castor’s struggle with identity and legacy. The clone storyline adds a compelling philosophical layer, questioning what makes a person who they are and whether destiny can be manufactured. I loved the original Castor, his determination, and the way he led his team. The epilogue was intense and completely unexpected. I was surprised. Haunter Grey – Execution is a fantastic addition, and I highly recommend it to fans of the series.

In Haunter Grey: Execution, Last Ark - Haunter Grey Book 10 by Ross C Miller, Josephs, once the Resistance’s leader, launched a failed offensive to prevent their shift toward the more capable Grey Fleet. Captured during the battle, he revealed vital details about Castor and Genine to Unity before being executed along with his fleet. Unity adapted its ships and launched a pursuit of the Greys. Against all odds, the Greys turned the tide and fled with Castor’s kitacore and genetic material. From this, Unity engineered a Grimmerized replica of Castor. As Castor and his team push forward in their mission to locate the Adversary, they remain unaware that the clone is shaping their path. Unity’s ultimate objective is to eliminate Castor and use the clone to wipe out the Resistance and all non-Unity life.

Execution by Ross C Miller showcases strong writing and a fast-moving storyline anchored in a richly imagined science fiction setting. The book offers a steady progression of events that unfolds with precision, driven by characters who act with intent and intensity. Miller constructs his scenes with clear control, ensuring that each moment contributes to a broader sense of purpose. The pacing is consistent, and the language avoids excess while still maintaining reader interest across the shifting developments. Even the more technical elements like genetics, space fleets, and advanced planning are handled with assurance, never slowing the momentum. The book remains focused throughout, and action with calculated decisions pushes events forward. Miller maintains coherence while expanding the scope of his world, delivering a strong addition to the genre that rewards readers who appreciate purposeful storytelling and well-executed ideas.