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Author Steve Cavanagh’s background as a practicing lawyer in Belfast, Northern Ireland, directly informs the complex legal plotting of Thirteen. Before becoming a full-time writer, Cavanagh was a prominent civil rights attorney who specialized in cases involving discrimination and abuses of power. His legal career included a landmark 2010 victory where he represented a Polish factory worker who had been subjected to severe racial harassment. According to BBC News, Cavanagh secured what was at the time “the largest award of damages for race discrimination in Northern Ireland legal history” (Reid, Laura. “Steve Cavanagh: Becoming a civil rights lawyer was good training for becoming a novelist.” Yorkshire Post, 2026). This real-world experience fighting for clients against systemic injustice provides the authentic foundation for his protagonist, Eddie Flynn.
Cavanagh’s transition from law to fiction began in earnest with the 2015 publication of The Defence, released initially through Orion Books in the United Kingdom before being picked up by Flatiron Books in the United States. That debut was longlisted for the Crime Writers’ Association’s John Creasey New Blood Dagger, marking Cavanagh as a fresh voice in the crowded legal-thriller field. He followed it rapidly with The Plea (2016) and The Liar (2017), building a devoted readership across the Anglophone market. Thirteen, published in 2018, proved his commercial breakthrough, winning the Theakston Old Peculier Crime Novel of the Year in 2019 and being optioned for television. Subsequent Eddie Flynn novels, Fifty Fifty (2020) and The Devil’s Advocate (2021), have consistently reached the Sunday Times bestseller lists.
Beyond the Flynn books, Cavanagh has collaborated with fellow Belfast crime writer Adrian McKinty on the Cruel Acts podcast and co-founded the Two Crime Writers and a Microphone podcast alongside Luca Veste, further cementing his position within the contemporary British and Irish crime-writing community. He is a regular guest at Harrogate, Bloody Scotland, and Theakston festivals, and his novels have been translated into more than a dozen languages.
In Thirteen, Eddie’s courtroom tactics blend legal expertise with the cunning of a former con artist. For example, he wins a case by demonstrating that a detective could not have seen a straw in a McDonald’s bag, a trick based on precise measurements and procedural knowledge. This mirrors Cavanagh’s own use of meticulous preparation and an understanding of human fallibility to win cases. His detailed depiction of legal strategy is a product of years spent navigating the system he now dramatizes in his best-selling novels, including The Defence, The Plea, and the award-winning Thirteen.
Thirteen is the fourth installment in the popular Eddie Flynn series, which follows a New York-based con artist turned defense attorney. The series arc up to this novel traces Eddie’s uneasy attempt to leave the grift behind and rebuild a legitimate life at the New York bar. In The Defence (2015), Eddie is coerced by the Russian mafia into representing their boss in a Manhattan courtroom, with a bomb strapped to his back and his kidnapped daughter, Amy, as leverage. The novel establishes Eddie’s signature blend of con-artist misdirection and legal maneuvering, and it fractures his marriage to Christine.
The Plea (2016) finds Eddie pressured by the FBI into taking on the case of a tech billionaire accused of murder, in exchange for protection for Christine, who has been implicated in a money-laundering scheme at her law firm. The book deepens the series’ interest in institutional corruption and Eddie’s fraught efforts at reconciliation with his family. The Liar (2017) shifts to a kidnapping case involving the daughter of a former FBI agent, drawing Eddie into a hunt for a serial predator and testing his capacity for violence outside the courtroom.
By the time Thirteen opens, Eddie has been established as a lawyer who wins through unconventional means, haunted by past trauma but committed to defending the innocent. A surprising element of the series’ creation is that its author, a Belfast native, had never visited the United States when he wrote the first book. In an interview, Cavanagh confirmed this, explaining how he allowed the readers’ minds to fill in many of the details of the famous city (“A Guest Post from Steve Cavanagh, author of The Defense.” Linda’s Book Bag, 2016).
Cavanagh built Eddie Flynn’s world by immersing himself in the rich tradition of American crime and legal fiction, drawing on genre conventions and extensive research to create an authentic sense of place. This practice, while challenging, is not unique in literature. For instance, French author Jules Verne famously wrote detailed adventures set in the US, such as From the Earth to the Moon, decades before ever visiting the country, relying entirely on research to construct his settings.
For the Eddie Flynn series, this means that the New York depicted is a landscape filtered through the lens of classic crime novels and courtroom dramas. The landmarks, legal procedures, and character archetypes feel familiar because they are born from the same literary DNA that has defined the American thriller. Understanding this context highlights Cavanagh’s skill in using genre itself as a world-building tool, crafting a believable and compelling version of Manhattan’s legal underbelly from a world away.



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By Steve Cavanagh