Twenty Sectors (Arcturus 5) Books in Order

Part ofDebra Dunbar Books in Order

See the Twenty Sectors books by Debra Dunbar in order, with short summaries, series background, and where to start.

Last updated: July 9, 2026

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Twenty Sectors (Arcturus 5) books in publication order

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Two Souls

by Debra Dunbar

2016

Admiral Drake Lokenmran is blamed when freighters vanish in the Null Zone soon after humanity's war with the Shani. To clear his name, he has to uncover whether pirates, enemies, or something worse is striking at human space.

Twenty Sectors (Arcturus 5) books in chronological order

Two Souls
by Debra Dunbar
2016Twenty Sectors (Arcturus 5), Book 1

Series background & context

The Twenty Sectors or Arcturus 5 books are the science fiction side of Debra Dunbar's writing, published under D.L. Dunbar. So far this page is built around Two Souls, which makes it a smaller corner of her bibliography, but it is still useful because the tone and setup are very different from her demon-heavy fantasy work.

This is military and political science fiction, not paranormal romance in space.

The main figure in Two Souls is Admiral Drake Lokenmran, a war hero who does not get to enjoy that status for long. When freighters start vanishing in the Null Zone, blame lands on him fast. That setup tells you a lot about the series flavor. The trouble is not just external. It is also institutional. Reputation, command pressure, and the speed with which a hero can become a scapegoat are part of the danger.

The wider backdrop is a human civilization still dealing with conflict involving the Shani. That gives the book a tense borderland feel. Every disappearance could point to retaliation, piracy, political manipulation, or something even stranger. Instead of following one outlaw or one magical chosen one, the story follows someone inside the system who has to figure out what is happening before more ships disappear and the wrong people decide they already know the answer.

That makes the series a good fit for readers who like their speculative fiction a little cleaner and more strategic. The appeal is less about supernatural community and more about command decisions, investigation, and the way large institutions react under pressure. Even with only one current entry, you can see the lane it occupies inside Dunbar's body of work.

If you are coming to this page after the fantasy books, expect a change in gear. Twenty Sectors trades witches and demons for fleet politics, missing ships, and interstellar suspicion. The tension comes from space, war, and responsibility, with a lead who has to solve a crisis while the people around him are already deciding who should take the fall.