The Recommended Reading Order Path
If you are new to Dervla McTiernan, you have two excellent entry points depending on what kind of mystery you enjoy. For readers who love deep, character-driven police procedurals and ongoing character arcs, the best starting point is The Ruin, the award-winning debut that introduces Detective Inspector Cormac Reilly. If you prefer a fast-paced, standalone psychological thriller, start with What Happened to Nina?, a highly acclaimed story about family loyalty, media manipulation, and a shocking disappearance.
The Cormac Reilly Series
Dervla McTiernan’s flagship series is set in Ireland and follows Cormac Reilly, a detective who returns to Galway only to find himself entangled in cold cases, academic scandals, and deep-seated police corruption. While the series includes a couple of prequel novellas, reading the main novels in publication order is highly recommended to appreciate Reilly's personal and professional evolution.
Chronological Order vs. Publication Order
If you prefer to read the series in the order the events occur, the chronological sequence is as follows:
- The Sisters (Novella, Book 0.5 - Published in 2019)
- The Roommate (Novella, Book 0.7 - Published in 2020)
- The Ruin (Book 1 - Published in 2018)
- The Scholar (Book 2 - Published in 2019)
- The Good Turn (Book 3 - Published in 2020)
- The Unquiet Grave (Book 4 - Published in 2025)
Why We Recommend Starting with The Ruin
Although the novellas are chronological prequels, we suggest starting with The Ruin. Starting with the first full-length novel allows you to meet Cormac Reilly as the author originally introduced him, giving you a firmer grasp of the series' tone and stakes. Here is a breakdown of the books in the Cormac Reilly universe:
- The Sisters (2019): This audio-first prequel is set ten years before the events of The Ruin. It does not feature Cormac Reilly himself; instead, it focuses on Carrie Ryan and her sister Aifric as they navigate the early, challenging days of their careers in Dublin's criminal justice system.
- The Roommate (2020): Another prequel novella, this story follows Niamh Turley after her roommate is murdered. Cormac Reilly appears briefly as the investigator on the case, making this a bridge that introduces his methodical style.
- The Ruin (2018): The official start to the series. Cormac Reilly is pulled back into a twenty-year-old case involving a tragic family death, forcing him to confront ghosts from his past and systemic corruption in the Irish police force (An Garda Síochána).
- The Scholar (2019): Cormac's partner, Emma, discovers a body on the grounds of Galway University. The investigation plunges Cormac into the high-stakes, competitive world of pharmaceutical research and academic privilege.
- The Good Turn (2020): A police operation goes horribly wrong, forcing Cormac's colleague Peter Fisher into exile in a small coastal town, while Cormac deals with escalating internal politics and corruption back in Galway.
- The Unquiet Grave (2025): The long-awaited fourth novel. Cormac investigates a murder case after a body is discovered preserved in an Irish bog, forcing old secrets to the surface once more.
Dervla McTiernan's Standalone Novels
In addition to her series work, McTiernan has written several standalone thriller novels. These books offer completely separate stories and characters, moving beyond Irish borders to explore different settings and themes.
- The Murder Rule (2022): A gripping legal thriller set in the United States. It follows Hannah Rokeby, a law student who gets herself onto the Innocence Project at the University of Virginia. However, Hannah isn't there to save the death-row inmate; she is actively trying to sabotage the case for personal reasons tied to her mother's past.
- What Happened to Nina? (2024): Set in Vermont, this psychological thriller follows the disappearance of a young woman named Nina after a weekend trip with her boyfriend, Simon. The book shifts focus to the war between the two families—Simon's wealthy parents, who hire PR firms to protect him, and Nina's desperate parents, who will stop at nothing to find the truth.
- Three Reasons for Revenge (2026): Set in Melbourne, Australia, this thriller follows Detective Sergeant Judith Lee. After a young woman reports a sexual assault and subsequently vanishes, three identical, vindictive packages are sent to three unrelated targets, launching a dangerous game of vengeance that Judith must unravel.
Audible Original Standalone Novellas
McTiernan has also written standalone suspense stories specifically formatted for audio. These make for excellent, quick listens:
- The Wrong One (2022): A tense audio novella where a mother is arrested for murder, prompting her son to ask an estranged family friend—a detective—for help.
- The Fireground (2023): Set in Western Australia, this thriller follows two investigators probing a climate action group after a destructive bushfire.
What to Know Before You Start
Dervla McTiernan worked as a corporate lawyer in Ireland for twelve years before the financial crisis prompted her family's move to Perth, Australia. Her legal background shines through in the realistic procedural details, institutional politics, and legal maneuverings featured throughout her books.
For audiobook listeners, the Cormac Reilly series is narrated by Aoife McMahon. Her performance is highly praised by fans for bringing the Galway setting and distinct Irish accents to life, making the audiobooks an exceptional way to experience the series.