Order of Book Series
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Diana Cosby Books in Order

Diana Cosby has written 14 books, published between 2007 and 2020. The first book is His Captive (2007) and the newest is Forbidden Realm (2020). Publication order is the reading order below.

Books
14
Published
2007–2020
Pages on record
1,318 in 4 of 14 books
See all 14 books in order Printable Diana Cosby checklist

Diana Cosby writes historical romance. The MacGruder Brothers and the Oath Trilogy are two series by Diana Cosby. Subject headings mention Scotland, England, the Scottish War of Independence, kidnapping and retribution. The 14 catalogued books start with His Captive (2007) and end with Forbidden Realm (2020). An Oath Taken (2014), An Oath Sworn (2015) and Forbidden Legacy (2016) are included.

How many Diana Cosby books are there?

Diana Cosby has 14 books, released between 2007 and 2020. They include 2 separate series.

Diana Cosby Books in Publication Order

The table lists all 14 Diana Cosby 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 His Captive by Diana Cosby, book 1 of the MacGruder Brothers series (2007)
  2. Cover of His Conquest by Diana Cosby, book 3 of the MacGruder Brothers series (2010)
  3. Cover of His Destiny by Diana Cosby, book 4 of the MacGruder Brothers series (2011)
  4. Cover of Forbidden Vow by Diana Cosby, book 3 of the Forbidden series (2018)
  1. 1
    His CaptiveMacGruder Brothers #12007 · 304 pages · confirmed 2/4
    2007304
    Buy at Amazon USAmazon UK
  2. 2
    His WomanMacGruder Brothers #22008 · 340 pages · confirmed 2/4
    2008340
    Buy at Amazon USAmazon UK
  3. 3
    His ConquestMacGruder Brothers #32010 · 339 pages · confirmed 2/4
    2010339
    Buy at Amazon USAmazon UK
  4. 4
    His DestinyMacGruder Brothers #42011 · 335 pages · confirmed 2/4
    2011335
    Buy at Amazon USAmazon UK
  5. 5
    His SeductionMacGruder Brothers #52013 · confirmed 2/4
    2013–
    Buy at Amazon USAmazon UK
  6. 6
    His EnchantmentMacGruder Brothers #62013 · confirmed 2/4
    2013–
    Buy at Amazon USAmazon UK
  7. 7
    An Oath TakenOath Trilogy #12014 · confirmed 2/4
    2014–
    Buy at Amazon USAmazon UK
  8. 8
    An Oath BrokenOath Trilogy #22015 · confirmed 2/4
    2015–
    Buy at Amazon USAmazon UK
  9. 9
    An Oath SwornOath Trilogy #32015 · confirmed 2/4
    2015–
    Buy at Amazon USAmazon UK
  10. 10
    Forbidden LegacyForbidden #12016 · confirmed 2/4
    2016–
    Buy at Amazon USAmazon UK
  11. 11
    Forbidden KnightForbidden #22017 · confirmed 2/4
    2017–
    Buy at Amazon USAmazon UK
  12. 12
    Forbidden VowForbidden #32018 · confirmed 2/4
    2018–
    Buy at Amazon USAmazon UK
  13. 13
    Forbidden AllianceForbidden #42019 · confirmed 2/4
    2019–
    Buy at Amazon USAmazon UK
  14. 14
    Forbidden RealmForbidden #52020 · confirmed 2/4
    2020–
    Buy at Amazon USAmazon UK

Diana Cosby 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.

MacGruder Brothers in order

6 books
  1. 1. His Captive
  2. 2. His Woman
  3. 3. His Conquest
  4. 4. His Destiny
  5. 5. His Seduction
  6. 6. His Enchantment

Forbidden in order

5 books
  1. 1. Forbidden Legacy
  2. 2. Forbidden Knight
  3. 3. Forbidden Vow
  4. 4. Forbidden Alliance
  5. 5. Forbidden Realm

Oath Trilogy in order

3 books
  1. 1. An Oath Taken
  2. 2. An Oath Broken
  3. 3. An Oath Sworn

Do you have to read Diana Cosby books in order?

You only need to read Diana Cosby books in order within each series: the books listed here span 2 separate series, and each series has its own publication order.

Where to start with Diana Cosby

Start with His Captive (2007), the earliest published title.

What is the newest Diana Cosby book?

Forbidden Realm (2020) is the newest Diana Cosby book released so far.

Is there a new Diana Cosby book coming?

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

Diana Cosby at a glance

No recent titles
The newest Diana Cosby title on record dates from 2020, 6 years ago. No later title is catalogued.
Release pace
Diana Cosby books have appeared about one a year on average.
Length
1,318 pages across the 4 of 14 books with a recorded length, a median of 337 pages each.
Busiest decade
Most Diana Cosby books, 11 of 14, were published in the 2010s.

What the Diana Cosby books are about

8 of the 14 Diana Cosby books carry subject tags in Open Library's catalogue. The subjects below are the ones that recur across them, most frequent first: history is tagged on 4 of 8. The subjects are cataloguers’ headings, not a plot summary.