Rough Diamond - Rough Justice
By Avien Gray
Publisher: Avien Gray
Page Length: 466
Genre: Political Thrillers & Suspense / Historical Fiction
After a first kill, MI5 Agent and erstwhile photographer Cain becomes an undercover, extra-judicial killer for a secret Bureau.
Recovering from injuries sustained protecting the Royal Family, Cain embracesa new life and romance in sun-drenched Australia, leaving his past life behind.
But when tragedy strikes, he is on the move again. This time to a new career in the world of diamond dealings in Florida.
Curiosity takes Cain to the diamond world in South Africa, where his past finally catches up with him, the criminal world allies against him and he becomes a killer again.
In Cain's action-packed escapades, a spectacular betrayal takes him into the rigours of a Chinese prison where the truth about his past begins to unravel.
Aided by a loyal band of friends from the shadowy world of intelligence, he delivers his own particular brand of rough justice.
However, with enemies closing in on all sides, will Cain prevail?
Trigger warnings: violence, murder

Rough Diamond – Rough Justice by Avien Gray pulled me in quickly and kept the pressure on throughout. At first glance, it reads like a fast-paced thriller packed with espionage, crime, and international stakes, but as the story unfolds, it becomes clear that it’s also about moral choices and the consequences that follow them.
The story centers on Cain, a former MI5 surveillance photographer whose life unravels after a job goes badly wrong. What I found interesting about Cain is that he doesn’t start out as a traditional action hero. He’s used to watching from the sidelines rather than being directly involved, and that background shapes both his decisions and how the story is told. There’s a strong visual feel to the writing, almost as if scenes are being viewed through a camera lens, which made everything feel immediate and believable.
Avien Gray’s writing style suits the genre well. The prose is sharp and to the point, without unnecessary embellishment. The pacing is tight, especially during the action scenes, which move smoothly without becoming confusing. The dialogue stood out to me in particular — it feels natural and unforced, especially in the exchanges between Cain and his friend Jerry.
The friendship between Cain and Jerry adds some much-needed warmth to the story. Their banter and loyalty give the book emotional grounding, which makes the darker moments more effective. When things go wrong, there’s a real sense that something meaningful is at risk, not just the success of a mission.
The story moves through several locations, including Britain, Australia, and parts of South Africa tied to the diamond trade. These settings aren’t just there for variety; each one reflects a shift in Cain’s situation and state of mind. As his circumstances worsen, the environments become harsher, reinforcing the sense that he’s losing control of his life.
Some of the strongest sections involve betrayal and imprisonment. These moments strip Cain of his sense of agency and force him to confront the consequences of the choices he’s made. I appreciated that the book doesn’t shy away from showing how quickly things can fall apart.
What sets Rough Diamond – Rough Justice apart from a more straightforward thriller is its focus on moral uncertainty. Cain is capable and sometimes ruthless, but he’s never presented as invincible. Guilt, doubt, and loss follow him, and the story makes it clear that violence and deception come at a cost.
The plot is busy, with a lot happening in a short span of time, but that felt intentional to me. The pace mirrors Cain’s descent into a world where events move faster than he can manage. Readers who enjoy thrillers with strong momentum and character depth will likely see this as a positive.
I recommend this book to those who enjoy high action thrillers.
This novel is available on Amazon, Apple and B&N
Avien Gray
Avien Gray, the English author behind Rough Diamond – Rough Justice, brings a wealth of experience to his gripping debut novel. Born in the UK, Gray has led a dynamic, bachelor’s life marked by an impressive array of skills and global adventures. He has a driver’s license, motorbike license, and pilot’s license. His physical discipline extends to martial arts, where he earned a karate black belt, complemented by a lifelong passion for photography that captures the world through his discerning lens.
Gray’s rumoured travels paint the picture of a man unbound by borders. He is said to have spent many months in Saudi Arabia, Australia, the USA, South Africa, Europe and China. This rich tapestry of experiences infuses his writing with authenticity, lending a vivid, worldly edge to the thrilling narrative of his complex protagonist: a man called Cain.
Avien and his best friend shared a flat and went out with various female friends together. They had a great time. As it says in the book when Cain is talking with his best friend: a Royal Protection Officer.
‘We will have to write that book when we retire,’ Cain said.
They looked at each other with knowing smiles – for a long few seconds.
‘All those secrets,’ said Jerry. ‘Perhaps we will.’
And time moved on.
But in real life, his best friend tragically died – leaving Avien to write their book alone.