Below is the complete list of Allison Brennan’s Seven Deadly Sins books in order. For this series, the chronological reading order is the same as the order of publication.
Publication Order of Seven Deadly Sins Books
About Seven Deadly Sins
Allison Brennan’s Seven Deadly Sins series is one of the clearest departures from her more traditional FBI, private-investigator, and romantic suspense work. Instead of grounding the danger entirely in human crime, the series moves into supernatural suspense, with demons, black magic, possession, faith, and moral corruption driving the central conflict. The books still carry Brennan’s familiar pace and investigative tension, but the stakes are larger and darker: evil is not only a human act here, but a force that can be summoned, released, and spread.
The main figure in the series is Moira O’Donnell, a woman whose past is tied directly to witchcraft and demonic power. Moira is not an outsider who simply discovers the supernatural world by accident. She comes from it, understands its danger, and has spent years trying to stop the person most closely connected to her own history: her mother, Fiona. That personal connection gives the series its strongest emotional engine. Moira’s fight is not abstract or symbolic. It is shaped by family damage, guilt, fear, and the knowledge that the evil she is hunting has roots in her own life.
Original Sin sets the series in motion when dark magic releases demonic forces connected to the seven deadly sins. Brennan uses Santa Louisa, California, as the first major pressure point, turning a small city into the stage for a supernatural outbreak that has both spiritual and physical consequences. The novel introduces the central conflict between Moira, Fiona, and the demonic powers that threaten to break into the world more fully. It also establishes Rafe Cooper, whose role brings another layer of knowledge, faith, and emotional tension to Moira’s struggle.
Carnal Sin continues almost directly from the aftermath of the first novel, moving the danger into Los Angeles as new deaths suggest that the demonic threat has not been contained. This is where the series begins to feel less like a single supernatural incident and more like an escalating war. Brennan’s use of the deadly sins gives each threat a distinct moral flavor. The danger is not only that people may be attacked, but that human weakness can be manipulated and intensified by forces that understand desire, envy, fear, pride, and temptation.
The shorter works connected to the series, including Deliver Us From Evil and Ghostly Justice, help widen the world around the main novels. They are useful for readers who want a fuller sense of the supernatural framework and the supporting characters, though the central momentum remains with Moira’s confrontation with Fiona and the demonic forces unleashed through black magic. The series structure can look slightly uneven because it includes novellas as well as full-length books, but the core arc is easy to understand: Moira is trying to stop an evil that is both ancient and painfully personal.
Mortal Sin brings the series back to the larger consequences of what was released earlier. By this point, Brennan has established the central pattern clearly: supernatural danger works through human vulnerability, and Moira’s greatest challenge is not only fighting demons but surviving the emotional cost of the fight. Her past as a former witch, her family connection to Fiona, and her uneasy alliances all make her a more complicated heroine than a standard demon hunter.
Seven Deadly Sins is best read as paranormal romantic suspense rather than a conventional crime series. It has investigation, danger, and Brennan’s usual sense of momentum, but its identity comes from the collision between faith, dark magic, personal guilt, and supernatural evil. For readers who know Brennan mainly through law-enforcement thrillers, this series shows a different side of her storytelling: more occult, more apocalyptic in tone, but still built around damaged people trying to stop violence before it spreads further.