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Former Federal Prosecutor Turns Legal Experience Into Crime Thriller Series

By Emerson Gray · Friday, March 20, 2026
Finn's Take· TL;DR
  • Former federal prosecutor Paul Coggins brings authentic courtroom experience to his legal thriller series, having prosecuted high-profile cases and worked across the justice system.
  • Chasing the Chameleon follows defense lawyer Cash McCahill protecting a transgender paralegal from a serial killer targeting trans women in Dallas, blending current social issues with crime fiction.
  • Coggins balances practicing white-collar defense law with writing, creating relatable underdog characters that reflect real legal practice serving vulnerable populations.
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Real-World Experience Drives Fiction

Paul Coggins, a former U.S. attorney for the Northern District of Texas, leverages his up-close-and-professional experience with the judicial system to drive Chasing the Chameleon, the third installment of the Cash McCahill series. The book was released on March 3 and is available at Interabang Books. Unlike typical legal thrillers written by authors with limited courtroom experience, Coggins brings the authenticity of someone who has prosecuted high-profile cases and defended A-list entertainers, Fortune 500 executives, and professional athletes.

Early in his career, he immersed himself in various corners of the system. He worked in prisons, went on ride-alongs with cops, clerked for a judge, handled pro bono cases and dealt with a variety of family law issues. Nowadays, Coggins practices law as a partner at Troutman Pepper Locke LLP, focusing on white-collar crime defense and corporate matters. This breadth of experience allows him to craft stories that resonate with both legal professionals and general readers who crave authentic detail.

Coggins lends Chasing the Chameleon a dose of realism, as many of the small details and characters (such as Tina) are derived from actual encounters on the job. He gave his best and truest line to Cash, when he said, "The worst day in trial is better than the best day behind a desk."

High-Stakes Plot Tackles Contemporary Issues

The action opens with fiercely loyal defense lawyer Cash McCahill standing outside the Dallas Public Library amid an identity crisis. On the heels of a clash with a drug cartel in book two, Cash dons a surgically altered face to complement a new alias. He's lying low in the role of grandfather to Tina, a transgender woman who overcame homelessness to become a tenacious paralegal.

McCahill is on high alert when a serial killer begins targeting trans women in Dallas with intensifying cruelty. Chasing the Chameleon follows his effort to find the killer and protect Tina as she rallies the community and works with the police to solve the murders. Envision Deep Ellum, Uptown and Oak Lawn as the backdrop for scenes with overzealous protestors and an ambivalent police force.

Forced to abandon his cover to protect Tina and her vulnerable community, Cash faces not one but two deadly threats. The novel weaves together current social issues with traditional crime thriller elements, creating a story that feels both timely and timeless.

Character-Driven Storytelling

McCahill's firm, Coggins says, is always positioned as the "underdog going up against Goliath." He says the story will resonate with fans of esteemed crime writers such as Michael Connelly, Erle Stanley Gardner and John Grisham Jr. The author, 74, fills the pages of his novel with a range of identities, creating relatable characters for every reader. "[Cash has] an assistant that's been with him for 20 years, who may or may not be in the country legally," Coggins says.

One of the keys to Cash is not only is he good in the courtroom, but he's got this firm that is sort of the firm of broken toys," says Coggins. This approach creates a cast of characters that reflects the complexity of real legal practice, where attorneys often represent society's most vulnerable members.

Future of Legal Fiction

Coggins says he has more Cash McCahill stories in the pipeline. "The only time I'm not writing is when I'm in trial, because trial is all-consuming," he says. His dual career as practicing attorney and novelist gives him a unique perspective that continues to evolve with each case he handles and each book he writes.

The success of the Cash McCahill series demonstrates readers' appetite for legal thrillers grounded in authentic experience rather than Hollywood stereotypes. As legal dramas become increasingly popular across all media platforms, authors like Coggins who can blend real-world expertise with compelling storytelling are positioned to capture audiences seeking both entertainment and insight into how the justice system actually works. "Being a federal prosecutor is the best job in the world. Writing about them is the second-best job."

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