Below is the complete list of Cynthia Eden’s Dark Sins books in order. For this series, the chronological reading order is the same as the order of publication.
Publication Order of Dark Sins Books
About Dark Sins
Cynthia Eden’s Dark Sins series is a compact romantic suspense duology set largely around New Orleans and built on deception, undercover work, murder investigations, and men whose dangerous reputations make them difficult to distinguish from the criminals being hunted. The two novels feature different central couples, but they are linked through recurring characters and the shadowy world surrounding Kace Quick and Remy St. Clair. Eden’s official bibliography identifies Don’t Trust a Killer and Don’t Love a Liar as the complete Dark Sins sequence.
Don’t Trust a Killer introduces FBI agent Bree Harlow during an undercover operation targeting Kace Quick, the wealthy owner of the New Orleans nightclub Fantasy. Three women have been murdered, and Kace is the FBI’s chief suspect. His reputation makes that suspicion plausible: he is known as a powerful and potentially dangerous figure with connections throughout the city’s criminal world. Bree takes a job at his club hoping to gather evidence, only to discover almost immediately that Kace recognizes what she really is.
That mutual awareness gives the first novel much of its tension. Bree believes she may be working close to a murderer, while Kace knows a federal agent has deliberately entered his territory. Their attraction develops alongside an investigation that becomes increasingly complicated when someone begins targeting Bree and evidence suggests Kace may be deliberately framed for crimes he did not commit. Eden uses the setup to keep the romantic relationship inseparable from the central mystery: trusting Kace could endanger Bree’s career and life, but refusing to reconsider the evidence could leave the actual killer free.
Remy St. Clair emerges from Kace’s circle as one of the figures connecting the books. In Don’t Love a Liar, Eden reveals much more about him, including the fact that his ability to adopt identities and disappear into roles has made him an exceptionally useful covert operative for the FBI. His past includes crime, theft, violence, corporate power, and undercover personas, leaving even the woman at the center of his new assignment unable to know who he truly is.
That assignment involves Kennedy Clarke, whose brother has been linked to a series of brutal murders. Remy is supposed to approach Kennedy, gain her confidence, and discover what she knows. She believes he is becoming her protector at a time when suspicion and danger are closing around her; he knows from the beginning that their relationship is based on a lie. As threats against Kennedy become more immediate, Remy’s professional manipulation collides with genuine attachment, creating a different form of the trust problem that defined Bree and Kace’s story.
The duology consequently works through two complementary reversals. In the first book, an FBI agent must decide whether the apparent criminal she suspects may actually be innocent. In the second, a threatened woman believes she has found safety with a man who is secretly deceiving her on behalf of the FBI. Eden shifts which character possesses the dangerous information, but both romances depend on the same uncertainty about identity, motive, and whether someone with a violent history can still become trustworthy.
Dark Sins is more tightly connected than two unrelated suspense romances, yet each novel has its own couple and principal investigation. The recurring criminal and federal worlds provide continuity without turning the series into one long case. Its defining idea is captured in the contrast between its two titles: killers may not be what they seem, liars may have reasons for deception, and attraction becomes most dangerous when neither person can be certain how much of the truth the other is withholding.