Below is the complete list of Sadie Kincaid’s London Ruthless books in order. For this series, the chronological reading order is the same as the order of publication.
Publication Order of London Ruthless Books
- Heart of a Devil (2025)
Heart of a Devil is a 2025 release and appears as book #3 in the London Ruthless series.
About London Ruthless
Sadie Kincaid’s London Ruthless series is a dark romance duet made up of Dark Angel and Fallen Angel. Compared with her larger Ruthless-world branches, this series is much tighter in scope, focusing on a single central relationship rather than moving through several siblings, couples, or family factions. It still carries the hallmarks of Kincaid’s wider style—dangerous men, high emotional stakes, possessive devotion, secrets, and love shaped by power—but it plays out in a more concentrated two-book arc.
The first book, Dark Angel, introduces Gabriel Sullivan, a powerful gangster figure whose presence defines the atmosphere of the duet. He is written in the morally grey mode that Kincaid readers expect: controlled, dangerous, protective, and difficult to separate from the criminal world around him. The heroine’s relationship with Gabriel is not framed as soft or uncomplicated. It is built around attraction, fear, power imbalance, and the question of whether someone associated with darkness can still become the person who offers protection rather than destruction.
The London setting gives the series a different flavor from Kincaid’s New York, Chicago, and L.A. mafia romances. Rather than using a sprawling family-saga structure, London Ruthless feels more like a dark, intimate underworld romance. The city is not described as a cozy backdrop; it is a world of hidden danger, reputation, violence, and private arrangements. Kincaid uses that atmosphere to heighten the sense that love in this world is never separated from risk.
Fallen Angel continues the same relationship and deepens the consequences of the first book. That continuation is important because London Ruthless is not a standalone-couple series where the central conflict resolves cleanly after one installment. The duet format allows the romance to move through damage, escalation, fallout, and emotional reckoning. Gabriel’s darkness is not merely decorative, and the heroine’s involvement in his world is not treated as a simple fantasy of wealth or danger. The second book has to deal with what it means to love someone whose life is tied to violence and control.
One of the most useful ways to understand London Ruthless is as an early, compact expression of Kincaid’s dark-romance identity. The series does not have the broader ensemble structure of Chicago Ruthless or the reverse-harem family intensity of New York Ruthless. Instead, it focuses tightly on the magnetic pull between two people caught in a dangerous emotional and criminal orbit. That makes it easier to read as a self-contained duet, though it also sits naturally beside the wider Ruthless universe in tone and reader appeal.
The “Angel” titles also give the series its central contrast. Gabriel’s name and the imagery around darkness and falling create a romance built on contradiction: danger and salvation, corruption and loyalty, fear and devotion. Kincaid often writes love as something extreme, not mild, and London Ruthless fits that pattern clearly. The emotional appeal comes from watching guarded characters move from control and survival toward a form of commitment that is intense, imperfect, and absolute.
London Ruthless is best understood as a dark mafia-style romance duet for readers who prefer a focused, two-part relationship arc over a large interconnected family saga. It is dramatic, high-heat, and built around the tension between wanting safety and being drawn to danger.