Order of Book Series
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Thomas DePrima Books in Order

Thomas DePrima has written 21 books, published between 2008 and 2019. The first book is A Galaxy Unknown (2008) and the newest is Lieutenant Marcola (2019). Publication order is the reading order below. 12 of the 21 books listed here are in the A Galaxy Unknown series, which has its own page: A Galaxy Unknown books in order.

Books
21
Published
2008–2019
Pages on record
5,850 in 17 of 21 books
Reading time
98–146 hours

Reading time is an estimate, not a recorded figure: 5,850 pages at 300 words a page, read at 200–300 words a minute, covering the 17 of 21 titles with a page count on record.

See all 21 books in order Printable Thomas DePrima checklist

Thomas DePrima wrote space opera, with 21 books published from 2008 to 2019. A Galaxy Unknown (2008) shares its name with DePrima's main series, and related series are AGU: Border Patrol and AGU: Space Command Intelligence. DePrima's other series are Arlene Watson and Colton James. Titles include The Clones of Mawcett (2010), Valor at Vauzlee (2010) and Return to Dakistee (2011). Lieutenant Marcola (2019) is the last book, and the catalogue is likely complete.

How many Thomas DePrima books are there?

Thomas DePrima has 21 books, released between 2008 and 2019. They include 5 separate series.

Thomas DePrima Books in Publication Order

The table lists all 21 Thomas DePrima books in the order they were published, with the release year, the page count where one is on record, and how many independent book listings confirm each title. Catalogue data as of September 2026.

  1. Cover of A Galaxy Unknown by Thomas DePrima, book 1 of the A Galaxy Unknown series (2008)
  2. Cover of The Clones of Mawcett by Thomas DePrima, book 3 of the A Galaxy Unknown series (2010)
  3. Cover of Valor at Vauzlee by Thomas DePrima, book 4 of the A Galaxy Unknown series (2010)
  4. Cover of Trader Vyx by Thomas DePrima, book 5 of the A Galaxy Unknown series (2010)
  5. Cover of Castle Vroman by Thomas DePrima, book 6 of the A Galaxy Unknown series (2011)
  6. Cover of Against All Odds by Thomas DePrima, book 7 of the A Galaxy Unknown series (2011)
  7. Cover of Return to Dakistee by Thomas DePrima, book 8 of the A Galaxy Unknown series (2011)
  8. Cover of Citizen X by Thomas DePrima, book 1 of the AGU: Border Patrol series (2012)
  9. Cover of The Star Brotherhood by Thomas DePrima, book 1 of the AGU: Space Command Intelligence series (2013)
  10. Cover of A World Without Secrets by Thomas DePrima, book 1 of the Colton James series (2014)
  11. Cover of Clidepp Requital by Thomas DePrima, book 2 of the AGU: Border Patrol series (2014)
  12. Cover of Azula Carver by Thomas DePrima, book 10 of the A Galaxy Unknown series (2015)
  13. Cover of Vengeance is Personal by Thomas DePrima, book 2 of the Colton James series (2016)
  14. Cover of When the Spirit Calls by Thomas DePrima, book 2 of the Arlene Watson series (2016)
  15. Cover of Clidepp Deja Vu by Thomas DePrima, book 3 of the AGU: Border Patrol series (2016)
  16. Cover of Changing of the Guard by Thomas DePrima, book 11 of the A Galaxy Unknown series (2017)
  17. Cover of The Invasion Begins by Thomas DePrima, book 12 of the A Galaxy Unknown series (2018)
  1. 1
    A Galaxy UnknownA Galaxy Unknown #12008 · 426 pages · confirmed 2/4
    2008426
    Buy at Amazon USAmazon UK
  2. 2
    When the Spirit Moves YouArlene Watson #12008 · confirmed 2/4
    2008–
    Buy at Amazon USAmazon UK
  3. 3
    Milor!A Galaxy Unknown #22010 · confirmed 2/4
    2010–
    Buy at Amazon USAmazon UK
  4. 4
    The Clones of MawcettA Galaxy Unknown #32010 · 438 pages · confirmed 2/4
    2010438
    Buy at Amazon USAmazon UK
  5. 5
    Valor at VauzleeA Galaxy Unknown #42010 · 342 pages · confirmed 2/4
    2010342
    Buy at Amazon USAmazon UK
  6. 6
    Trader VyxA Galaxy Unknown #52010 · 366 pages · confirmed 2/4
    2010366
    Buy at Amazon USAmazon UK
  7. 7
    Castle VromanA Galaxy Unknown #62011 · 346 pages · confirmed 2/4
    2011346
    Buy at Amazon USAmazon UK
  8. 8
    Against All OddsA Galaxy Unknown #72011 · 308 pages · confirmed 2/4
    2011308
    Buy at Amazon USAmazon UK
  9. 9
    Return to DakisteeA Galaxy Unknown #82011 · 328 pages · confirmed 2/4
    2011328
    Buy at Amazon USAmazon UK
  10. 10
    Citizen XAGU: Border Patrol #12012 · 342 pages · confirmed 2/4
    2012342
    Buy at Amazon USAmazon UK
  11. 11
    The Star BrotherhoodAGU: Space Command Intelligence #12013 · 186 pages · confirmed 2/4
    2013186
    Buy at Amazon USAmazon UK
  12. 12
    Retreat And AdaptA Galaxy Unknown #92013 · confirmed 2/4
    2013–
    Buy at Amazon USAmazon UK
  13. 13
    A World Without SecretsColton James #12014 · 348 pages · confirmed 2/4
    2014348
    Buy at Amazon USAmazon UK
  14. 14
    Clidepp RequitalAGU: Border Patrol #22014 · 352 pages · confirmed 2/4
    2014352
    Buy at Amazon USAmazon UK
  15. 15
    Azula CarverA Galaxy Unknown #102015 · 356 pages · confirmed 2/4
    2015356
    Buy at Amazon USAmazon UK
  16. 16
    Vengeance is PersonalColton James #22016 · 340 pages · confirmed 2/4
    2016340
    Buy at Amazon USAmazon UK
  17. 17
    When the Spirit CallsArlene Watson #22016 · 322 pages · confirmed 2/4
    2016322
    Buy at Amazon USAmazon UK
  18. 18
    Clidepp Deja VuAGU: Border Patrol #32016 · 342 pages · confirmed 2/4
    2016342
    Buy at Amazon USAmazon UK
  19. 19
    Changing of the GuardA Galaxy Unknown #112017 · 354 pages · confirmed 2/4
    2017354
    Buy at Amazon USAmazon UK
  20. 20
    The Invasion BeginsA Galaxy Unknown #122018 · 354 pages · confirmed 2/4
    2018354
    Buy at Amazon USAmazon UK
  21. 21
    Lieutenant MarcolaAGU: Border Patrol #42019 · confirmed 2/4
    2019–
    Buy at Amazon USAmazon UK

Thomas DePrima series and characters in order

Each link below opens a reading-order page with every book in publication order.

Thomas DePrima books grouped by series

Each title below is a row in the publication-order table above. None of these groups has a reading-order page of its own on this site.

AGU: Border Patrol in order

4 books
  1. 1. Citizen X
  2. 2. Clidepp Requital
  3. 3. Clidepp Deja Vu
  4. 4. Lieutenant Marcola

Arlene Watson in order

2 books
  1. 1. When the Spirit Moves You
  2. 2. When the Spirit Calls

Colton James in order

2 books
  1. 1. A World Without Secrets
  2. 2. Vengeance is Personal

AGU: Space Command Intelligence in order

1 book
  1. 1. The Star Brotherhood

Do you have to read Thomas DePrima books in order?

You only need to read Thomas DePrima books in order within each series: the books listed here span 5 separate series, and each series has its own publication order.

Where to start with Thomas DePrima

Start with the first book of the Thomas DePrima series you want to read: A Galaxy Unknown starts with A Galaxy Unknown (2008) and Galaxy Unknown starts with A Galaxy Unknown (2008). The earliest catalogued title overall is A Galaxy Unknown (2008).

What is the newest Thomas DePrima book?

Lieutenant Marcola (2019) is the newest Thomas DePrima book released so far.

Is there a new Thomas DePrima book coming?

No next Thomas DePrima book is announced in the catalogue, which is a gap in the listings it merges rather than a sign that the run has ended.

Thomas DePrima at a glance

No recent titles
The newest Thomas DePrima title on record dates from 2019, 7 years ago. No later title is catalogued.
Release pace
Thomas DePrima books have appeared more than one a year on average.
Length
5,850 pages across the 17 of 21 books with a recorded length, a median of 346 pages each.
Busiest decade
Most Thomas DePrima books, 19 of 21, were published in the 2010s.

What the Thomas DePrima books are about

4 of the 21 Thomas DePrima books carry subject tags in Open Library's catalogue. No subject is tagged on more than one of them, so each one below describes a single book. The subjects are cataloguers’ headings, not a plot summary.