Aldebarian Alliance Books in Order

The Aldebarian Alliance books take Duvall's shared universe and blow it wide open. What starts in her other series as a hidden fight on Earth turns into full-on space adventure here, with warships, alien races, rescue missions, prison breaks, and cultures learning how little they know about one another. It is still romance first, but the backdrop is much bigger, and the sense of motion is part of the fun.

This is where the universe goes interstellar.

The Lasaran sets the tone by bringing alien warrior Taelon to Earth in search of his missing sister, then throwing him into captivity and forcing him to rely on Lisa. From there, the series keeps widening. The Segonian sends Immortal Guardian Eliana into space and into Commander Dagon's orbit. The Purveli pairs telepathic Ava with fellow prisoner Jak'ri. The Akseli follows Simone and Janwar as a rescue mission turns into something much more dangerous. The later cyborg story pushes that thread even further, adding hidden survivors and fresh political trouble.

One of the nicest things about this series is that the science fiction stays readable. Duvall gives you the ships, weapons, alien societies, and bigger alliance politics you want, but she does not drown the books in jargon. The focus stays on people under pressure, what they owe their own worlds, and how attraction grows between characters who may come from completely different species, histories, and assumptions. There is a lot of action, but there is also a lot of teasing, culture shock, and hard-earned trust.

The ongoing stakes matter, too. These are not just separate couples floating through similar settings. There are hostile forces out there, especially enemies willing to kidnap, experiment on, or exterminate others to gain an advantage. That gives the series a steady thread of danger beneath the romance. Characters go missing. Allies search across the galaxy. Secrets about old wars and forbidden technology keep surfacing. Even when a book ends happily for its couple, the wider situation still feels alive.

It still feels very Dianne Duvall.

If you like sci-fi romance with adventure, humor, and a strong ensemble spirit, Aldebarian Alliance is the natural next step after Immortal Guardians. Readers coming from the earlier books will enjoy the familiar faces and shared lore, but new readers can still latch onto the clear setups and central couples. The main promise is simple: big-hearted romance, capable fighters, and a rescue mission that is always one bad turn away from becoming a lot more complicated.