Ruthless Vows A dark billionaire romance filled with obsession, betrayal, and forbidden desire. Tristan built his empire with cold precision and an iron heart. To the world, he's untouchable-London's most powerful businessman. But beneath the tailored suits and sharp control lies something far darker: a man who rules the city's underworld with his brothers, and never loses. When Isobel is dragged to the Ashbourne mansion as payment for her father's impossible debt, her world shatters. She was supposed to graduate, to dream, to be free. Instead, she becomes his collateral-a pawn in a deal that seals her fate. Tristan never planned to marry. But in Isobel, he sees an opportunity-to secure the one deal he's been chasing and tighten his grip on power. Her refusal isn't an option. Her obedience isn't negotiable. Yet the moment he looks into her eyes, the game changes. Hatred ignites into obsession. Fear becomes desire. And soon, the ruthless man who takes what he wants discovers there's one thing he can't control-his hunger for her. In a world built on vengeance, power, and sin, their vows will bind them in the most dangerous way of all.