Order of Book Series
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Delta Underground Operatives (DUO) Books in Order

Delta Underground Operatives (DUO) contains 17 books, published between 2023 and 2024. The first book is The Improbable Pair - Clara & Damien (2023) and the newest is Halo of Stars - Cin and Gui : Delta Underground Operatives (2024). Publication order is the reading order below.

Books
17
Published
2023–2024
See all 17 books in order Printable Delta Underground Operatives (DUO) checklist

Delta Underground Operatives (DUO) is a multi-author series of 17 catalogued books published across 2023 and 2024. Titles in the run pair two names: The Improbable Pair - Clara & Damien (2023) opens it, and Consuming Wind - Dani & Zeph, Cloak and Dagger - Val & Timmeron, Split Infinity - Jeanie and Ratt and Unholy Deuce - Amelia and Ichabod follow. Kat Lapatovich Healy is credited on four titles, Sarah Noffke on three, and S.W. Clarke and N.A. Grotepas on two each. The most recent entry is Halo of Stars - Cin and Gui (2024).

How many Delta Underground Operatives (DUO) books are there?

Delta Underground Operatives (DUO) has 17 books, released between 2023 and 2024.

Delta Underground Operatives (DUO) Books in Publication Order

The table lists all 17 Delta Underground Operatives (DUO) books in the order they were published, with the release year and how many independent book listings confirm each title. Catalogue data as of September 2026.

  1. 1
    The Improbable Pair - Clara & Damien2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  2. 2
    Hunter's Curse2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  3. 3
    The Reluctant Assassins - Clara and Damien2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  4. 4
    The Immutable Pact - Clara & Damien2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  5. 5
    Consuming Wind - Dani & Zeph2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  6. 6
    Cloak and Dagger - Val & Timmeron2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  7. 7
    Split Infinity - Jeanie and Ratt2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  8. 8
    Avenging Blade2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  9. 9
    Whisper and Blade2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  10. 10
    Unholy Deuce - Amelia and Ichabod2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  11. 11
    Halo of Light - Cin and Gui2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  12. 12
    Puppet Master - Nyc and Stel2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  13. 13
    Revenant's Brigade - Mac and Dink2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  14. 14
    Tempest and Steel2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  15. 15
    Broken Stars2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  16. 16
    Soul Reaper2023 · confirmed 1/4
    2023–
    Buy at Amazon USAmazon UK
  17. 17
    Halo of Stars - Cin and Gui : Delta Underground Operatives2024 · confirmed 1/4
    2024–
    Buy at Amazon USAmazon UK

Where to start with Delta Underground Operatives (DUO)

Start with The Improbable Pair - Clara & Damien (2023), the earliest published title.

What is the newest Delta Underground Operatives (DUO) book?

Halo of Stars - Cin and Gui : Delta Underground Operatives (2024) is the newest Delta Underground Operatives (DUO) book released so far.

Is there a new Delta Underground Operatives (DUO) book coming?

No next Delta Underground Operatives (DUO) book is announced in the catalogue, which is a gap in the listings it merges rather than a sign that the run has ended.

Delta Underground Operatives (DUO) at a glance

Still running
Delta Underground Operatives (DUO) is still running, with a title published as recently as 2024.
Release pace
Delta Underground Operatives (DUO) books have appeared more than one a year on average.
Busiest decade
Most Delta Underground Operatives (DUO) books, 17 of 17, were published in the 2020s.
Attribution
Of the 17 titles, 4 are credited to Kat Lapatovich Healy, 3 to Sarah Noffke, 2 to N.A. Grotepas and 2 to S.W. Clarke. A further 6 writers are credited.