Last Patient of the Night by Gary Gerlacher Review: A Propulsive Medical Thriller Debut

Last Patient of the Night is a medical thriller by Gary Gerlacher, published by Black Rose Writing in December 2023, and the first entry in the AJ Docker and Banshee Thriller series. Its central premise is immediate and morally charged: Dr. AJ Docker — known throughout as Doc — is an emergency room physician in Houston who cannot let go of the death of a nameless young woman who passes through his ER. Rather than return to his normal routine, Docker teams up with a policeman friend and a police dog to pursue answers, only to find that hunting for justice draws him deeper into the criminal world than any of them anticipated. The novel's structure weaves that investigative tension together with lighter, standalone vignettes drawn from everyday emergency room life, creating a dual-register narrative that moves between darkness and levity.

One of the novel's most documented assets is Gerlacher's professional background. A pediatric emergency physician who trained and practiced in multiple Texas emergency rooms before opening his own pediatric urgent care clinics, Gerlacher brings direct insider knowledge to the ER scenes in the book. As Tantor's synopsis notes, that experience "lends authenticity to the ER culture" — a quality that distinguishes the novel from thrillers that treat medicine as decorative backdrop. The setting is not a generic hospital of TV shorthand but a specific occupational environment rendered through someone who has worked in it. For readers who prize procedural credibility, this is a meaningful differentiator for a debut.

Gregory D. Lee, author of Stinger: An International Thriller, positioned the novel squarely within recognizable genre company: "Last Patient of the Night is M\A\S\H\ meets Detective Harry Bosch. It's a thriller that won't disappoint." That comparison is instructive — it flags the book's dual ambition: the sardonic, ensemble camaraderie of the long-running military dramedy on one side, and the dogged, morally serious urban detective work associated with Michael Connelly's Bosch on the other. Whether a debut can fully deliver on both halves of that comparison is the question readers will bring to the series, but the blurb establishes the tonal territory the novel is aiming for. It is the first of a six-book series, and the publisher notes that the AJ Docker and Banshee books can be read in any order — suggesting Gerlacher has constructed each volume to function as a self-contained entry point.

The synopsis from Tantor describes the novel as "action-packed" and credits it with "a cast of interesting characters," framing it as a book designed to keep readers engaged at the plot level while investing them in the people driving the story. The interplay between the thriller throughline — Docker's pursuit of justice for his unidentified patient — and the episodic lighter ER stories gives the novel a tonal variety that works against the relentlessness of pure action narratives. Doc himself is described across multiple sources as an ER physician with a sharp wit, and the combination of medical competence and investigative instinct positions him as a genre protagonist with a specific, profession-grounded identity rather than a generic amateur sleuth. The presence of a police dog as a named series co-protagonist (reflected in the series title, AJ Docker and Banshee) also suggests an ensemble dynamic with room to develop.

Readers drawn to medically grounded crime fiction — the procedural texture of the ER alongside the moral weight of an unresolved death — are the natural audience for this novel. The SuperSummary study guide notes that the source text includes depictions of substance use, graphic violence and torture, physical abuse, sexual violence, cursing, and death, which prospective readers should factor into their expectations. The novel does not appear designed for those seeking a cozy or restrained thriller; the criminal world Docker enters carries genuine darkness. Conversely, readers who enjoy character-driven ensemble series with a consistent protagonist and real-world occupational grounding — and who want a series they can enter at multiple points — will find the structure accommodating. As a debut, the book also carries the inherent limitation that its protagonist and supporting cast are still being established, making the payoff for long-term readers potentially cumulative across the series rather than fully realized in this first volume alone.