Books On Board

CSI Reilly Steel Books in Order

  • 9 Books
  • 2011 – 2022 Published

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Reading order
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How to Read the CSI Reilly Steel Series

The CSI Reilly Steel series, written by the husband-and-wife duo Melissa and Kevin Hill under the pseudonym Casey Hill, follows a brilliant, Quantico-trained forensic investigator who relocates from California to Dublin, Ireland. Joining the Garda Forensic Unit, Reilly Steel tackles complex cases that merge cutting-edge forensic science with psychological suspense.

Because the books have been published under different names in US, UK, and Irish markets, tracking them down can be confusing. Below is the recommended reading path and the complete chronological list, including all known alternate titles.

Recommended Reading Order

We recommend reading the series in chronological order so you can watch Reilly's character and personal life evolve. This order begins with the prequel novella:

  1. Crime Scene (also published as Quantico) — Prequel Novella (2014)
  2. Taboo (also published as Serial) — Book 1 (2011)
  3. Inferno (also published as Victim or Torn) — Book 2 (2012)
  4. Hidden (also published as The Perfect Life) — Book 3 (2013)
  5. The Watched — Book 4 (2014)
  6. Trace (also published as One Little Mistake) — Book 5 (2014/2015)
  7. Aftermath (also published as Pretty Guilty Secrets) — Book 6 (2015)
  8. Endgame (also published as The Perfect Lie) — Book 7 (2017)
  9. Last Girl Alive (also published as Fallout) — Book 8 (2022)
  10. The Profiler — Book 9 (2026)

Chronological vs. Publication Order

For the best narrative flow, reading chronologically is recommended. The only variance from the publication order is the prequel novella Crime Scene (also sold as Quantico). It was published in 2014, but details Reilly's early training years at Quantico before the events of Taboo. If you want to jump straight into the main action, starting with Taboo works perfectly, and you can read the prequel later as a flashback.

Regional Title Differences

Depending on where you buy the books, the titles may vary. Keep these regional changes in mind to avoid purchasing duplicates:

  • Taboo is sold as Serial in some digital markets.
  • Inferno is also published as Victim or Torn.
  • Hidden is sometimes associated with the title The Perfect Life.
  • Trace is also sold under the title One Little Mistake.
  • Aftermath is also known as Pretty Guilty Secrets.
  • Endgame has been published as The Perfect Lie.
  • Last Girl Alive was released in some markets as Fallout.

Frequently Asked

Where is the best place to start reading the CSI Reilly Steel series?

You can start either with the prequel novella Crime Scene (also known as Quantico) to learn about Reilly's early days, or jump straight into the first full-length novel, Taboo (also published as Serial).

Who is the author Casey Hill?

Casey Hill is the pen name of the Irish husband-and-wife writing team Melissa and Kevin Hill, who combine forensic research with thriller storytelling.

How many books are in the CSI Reilly Steel series?

As of 2026, there are nine full-length novels and one prequel novella (Crime Scene), making a total of ten books in the series.

Why do the CSI Reilly Steel books have multiple titles?

Publishers often change book titles to appeal to different regional markets. For example, the first book is titled Taboo in the UK and Ireland, but was released as Serial in the US and on certain digital platforms.

Can the CSI Reilly Steel books be read as standalones?

Yes, each mystery has a self-contained case that is resolved by the end of the book. However, reading them in order is highly recommended to follow the ongoing character development and overarching storylines.

What is the latest book in the CSI Reilly Steel series?

The latest book in the series is The Profiler, which was released in January 2026.