Divine Ruin (Sister Holiday Mysteries, Bk. 3)

A CrimeReads Best Crime Novel of January 2026

In the latest in the USA Today bestselling, award-winning, critically acclaimed series, New Orleans punk rock nun-detective Sister Holiday plunges into a “hellish underworld of drug trafficking, addiction, and her own dark past in a journey that is both riveting and sacred.” (Ana Reyes, New York Times bestselling author of The House in the Pines)

It’s a steamy, restless end of the school year in New Orleans. Sister Holiday is finishing her music classes and preparing for her permanent vow ceremony, a pivotal moment in her journey of faith. But when one of her favorite students is found dead of a fentanyl overdose, Sister Holiday and her partner-in-PI, Magnolia Riveaux, are determined to track down the drug dealers. As students continue to fall prey to this sinister drug, Sister Holiday becomes more desperate to stop the epidemic—while facing her own past with addiction, a demon that is never too far.

With Douaihy’s signature mix of grit, heart, and faith, Divine Ruin tests the limits of Sister Holiday’s devotion in her darkest and most shocking case yet.