Books On Board

UNSUB Books in Order

  • 4 Books
  • 2017 – 2024 Published

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Reading order
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The Recommended Reading Order for the UNSUB Series

Meg Gardiner’s UNSUB (Unknown Subject) series is a highly serialized psychological thriller saga. To fully appreciate the character growth, recurring relationships, and escalating emotional stakes, readers should follow the series in its official publication order. The storyline follows Caitlin Hendrix’s career trajectory from a local narcotics detective in the San Francisco Bay Area to a rookie profiler with the FBI’s elite Behavioral Analysis Unit (BAU).

  1. UNSUB (2017) – Caitlin is a narcotics detective in northern California who gets pulled into the hunt for "The Prophet," a Zodiac-like serial killer who terrorized her city—and broke her police detective father—decades earlier.
  2. Into the Black Nowhere (2018) – Now a rookie profiler in the FBI’s BAU, Caitlin travels to southern Texas near Austin to profile and capture a charismatic, Ted Bundy-inspired predator who abducts women on Saturday nights.
  3. The Dark Corners of the Night (2020) – Caitlin is dispatched to Los Angeles to hunt "The Midnight Man," an elusive killer who breaks into suburban homes, executes parents, and leaves their children behind as witnesses.
  4. Shadowheart (2024) – In this intense installment, Caitlin must navigate a deadly game of chess between two killers: Efrem Judah Goode, a notorious predator imprisoned in Tennessee, and a copycat known as the "Broken Heart Killer" who is recreating Goode's murders.

Is There a Chronological Order Difference?

No. The chronological order matches the publication order exactly. The narrative timeline directly tracks Caitlin Hendrix's career advancement, her ongoing struggle to process personal trauma, and her developing relationship with fellow agent Sean McKinnon. Reading these books out of order will expose major spoilers regarding the resolution of previous cases and Caitlin's personal life.

What to Know Before You Start

Meg Gardiner brings a unique level of realism to the series, drawing from her background as a lawyer and former writing instructor, as well as extensive research into actual FBI criminal profiling. The series stands out in the crowded thriller genre because its antagonists are heavily inspired by real-world killers, such as the Zodiac Killer and Ted Bundy. The narrative doesn't shy away from the psychological toll that profiling takes on investigators, exploring themes of obsession, generational trauma, and resilience.

Connections to Meg Gardiner's Shared Universe

While the UNSUB novels are self-contained cases, they exist within a broader shared universe established by Gardiner’s previous works. Readers of her earlier books may spot subtle easter eggs or shared references to the settings and minor characters from her other popular book series:

  • The Evan Delaney Series: Gardiner’s debut series featuring a freelance journalist and legal assistant in California.
  • The Jo Beckett Series: A forensic psychiatrist based in San Francisco who previously crossed over with Evan Delaney in the novel The Nightmare Thief (2011).

Although you do not need to read these other series to understand Caitlin Hendrix’s journey, they share the same sharp, realistic, and high-tension atmosphere that Gardiner is famous for.

Adaptations and Screen Status

In 2020, Amazon Studios acquired the television rights to The Dark Corners of the Night to develop it as a potential hour-long drama series. Showrunner Larry Trilling, along with executive producers Shane Salerno and Billy Bob Thornton, were attached to the project. While it has been widely promoted as in development, no official release date or active production updates have been announced, meaning fans will have to stick to the books for the foreseeable future.

Frequently Asked

Can the UNSUB books be read as standalones?

While each book features a self-contained investigation with a resolved mystery, the overarching story of Caitlin Hendrix's career, her relationship with Sean McKinnon, and her struggle with family trauma develops sequentially. It is highly recommended to read them in order starting with UNSUB.

Which real-life cases inspired the killers in the UNSUB series?

The series draws heavily from true crime. The Prophet in UNSUB is inspired by the Zodiac Killer, while the charismatic predator in Into the Black Nowhere is inspired by Ted Bundy.

When was Shadowheart published?

Meg Gardiner's fourth UNSUB novel, Shadowheart, was officially released by Blackstone Publishing on June 18, 2024.

Is there a TV show based on the UNSUB books?

The third novel, The Dark Corners of the Night, was optioned for development as an hour-long TV series by Amazon Studios. However, there has been no official release or active production updates as of mid-2026.

What order should I read Meg Gardiner's books in?

For the UNSUB series specifically, you should read them in publication order: UNSUB, followed by Into the Black Nowhere, The Dark Corners of the Night, and finally Shadowheart.