Reading order
| # | Title | Published | Author | Buy on Amazon |
|---|---|---|---|---|
| 1 | The Lost Relic | 2023 | Joshua James | Buy |
| 2 | The Sacred Stone | 2023 | Joshua James | Buy |
| 3 | The Secret Cities | 2024 | Joshua James | Buy |
| 4 | The Secret Cities: ENIGMA Files, Book 3 | 2024 | Joshua James | N/A |
ENIGMA Files is a four-book series by Joshua James, beginning with The Lost Relic in 2023 and continuing through The Sacred Stone, and two volumes of The Secret Cities in 2024. The series follows an investigative team dealing with mysterious artifacts and hidden historical secrets, a departure from James’s space-focused military sci-fi output.
The series moves quickly through its four books, with each entry presenting a new discovery or threat tied to the overarching ENIGMA organization. Readers who prefer James’s more grounded thrillers over his space opera work will find ENIGMA Files a suitable entry point.