He came to Ireland to secure an alliance. Falling for the promised bride could destroy it. Finn O’Connor is the strategist his family trusts when failure is not an option. Sent to the Irish coastal city of Dunmara, he has two objectives: expose the traitor who aided the O’Connors’ enemy and protect a powerful alliance through an arranged marriage. Sorsha O’Rourke has always known that duty comes before desire. Marrying Darragh Murphy will safeguard her family’s future and unite two powerful organizations. She accepts the match willingly—even if it means surrendering any hope of marrying for love. Then Finn begins investigating her uncle. Forced to work together as betrayal closes around them, Sorsha discovers the ruthless control beneath Finn’s silence—and the fierce loyalty he hides from everyone else. Finn knows wanting another man’s intended bride could fracture the alliance he was sent to save. But with the wedding approaching, resisting Sorsha becomes the one battle he cannot win. One forbidden night changes everything. By morning, Finn has regained his reason—and shattered Sorsha’s trust by calling their night a mistake. When their passion leaves an unexpected consequence, Finn must do more than offer protection or obligation. He must find a way to preserve the alliance, stop a traitor, and prove that choosing Sorsha is not his greatest failure. It is the most ruthless vow he will ever make. A Ruthless Vow, Book Two in The Brannock Series, is a dark, emotionally charged organized-crime romance featuring forbidden love, an arranged marriage, an unexpected pregnancy, a controlling protective hero, family betrayal, open-door intimacy, and a guaranteed happy ending.