Casey Hill Books in Order

If you want the main entry point: Taboo / Serial → Inferno / Victim / Torn → Hidden / The Perfect Life
If you want Reilly's backstory first: Crime Scene / Quantico → Taboo / Serial → Inferno / Victim / Torn
If you like the series once the personal stakes deepen: The Watched → Trace / One Little Mistake → Aftermath / Pretty Guilty Secrets → Endgame
If you want the newer books after meeting the cast: Endgame → Last Girl Alive / Fallout → The Profiler

Casey Hill is the pen name used by Irish husband-and-wife writers Kevin and Melissa Hill. Melissa grew up in County Tipperary and later made her home in Wicklow. Before the Casey Hill books arrived, she had already built a big readership with contemporary fiction, while Kevin came to writing from a different direction and brought a practical eye for structure and plot.

The crime novels began as a collaboration at home.

Melissa has said she wanted to explore darker material, and one early thriller idea became the spark. When Kevin had more time during the property slump, he got involved in finishing the manuscript, adding story turns and helping shape the partnership that became Casey Hill. That book was Taboo / Serial, published in 2011, and it introduced forensic investigator Reilly Steel.

Reilly turned out to be a keeper.

Across books like Taboo / Serial, Hidden / The Perfect Life, The Watched, and Last Girl Alive / Fallout, the Hills built a series that mixes crime-scene detail with a lead who is smart, stubborn, and very human. Reilly is California-born, Quantico-trained, and working between Irish and American worlds, which gives the books a slightly off-balance feeling that suits the stories. Readers tend to come for the pace and the puzzles, but they stay for Reilly, her grief, her blind spots, and the way each case pushes at the edges of her private life.

The books are forensic thrillers, but they do not disappear into jargon. The science matters, yet the writing keeps moving. Again and again, the Hills return to questions of family damage, missing pieces from the past, hidden motives, and the uneasy space where intuition meets evidence. Dublin is a big part of the series too, not just a backdrop but a working city full of pressure, history, and watchful eyes. Later books widen the map to Florida and the orbit of Daniel Forrest, Reilly's former mentor.

Melissa's earlier career still matters to understanding the partnership. Under her own name she wrote bestselling women's fiction, including Something from Tiffany's and A Gift to Remember, books built around relationships, secrets, and emotional turning points. The shift to crime sounds sharp on paper, but there is a clear thread between the two names: she likes stories that turn on one discovery and change everything around it.

Together, Kevin and Melissa found a useful split.

The Casey Hill books have the procedural backbone of a crime series, but they also care about the mess people carry into a room before the investigation even starts. The family has long been based in Ireland, and Melissa has spoken about writing from County Wicklow while balancing deadlines, home life, and more than one strand of a writing career. That mix probably helps explain why the Casey Hill novels feel worked out rather than manufactured. They read like books built by two people who enjoy the puzzle, but who also know that the puzzle is not the whole point.