Assassin (Oligarch Book 2) by Stu Armstrong

In the explosive sequel to Oligarch, former KGB operative turned deadly renegade Dmitri Korsakov returns to the shadows—this time to dismantle a global conspiracy that threatens to plunge the world into chaos.

When a botched drone deal in London reveals the growing power of Black Lion—a clandestine international arms network—Dmitri is thrust back into a world of espionage, betrayal, and brutal violence. With the West compromised and old enemies resurfacing, Dmitri must cross borders and moral lines to stop a syndicate he once unknowingly helped build.

His mission takes him from the rain-soaked streets of London to the war-scarred forests of Serbia, where an abandoned Yugoslav military base has become the operational nerve center of Black Lion. Guarded by elite mercenaries, AI surveillance, and a ruthless hierarchy, the base holds the key to the group’s expansion and the heart of the corruption—Andrei Orlov, a monstrous figure from Dmitri’s past.

As alliances tighten and time runs out, Dmitri, along with his loyal allies Elena and Oleksandr, launches a final, brutal assault on the mountain fortress. What follows is a harrowing descent into fire and fury, culminating in a savage, bare-handed fight between Dmitri and Orlov—one that will decide the fate of the Black Lion syndicate.

Assassin is a visceral, high-stakes thriller filled with raw violence, political intrigue, and the unforgiving truth of what it takes to wage war in the modern age. In a world of ghosts and shadows, Dmitri Korsakov is no longer an agent or a fugitive. He’s an assassin—and he’s just getting started.