Demon World

Undying Mercenaries, Book 24

By: B.V. Larson

Narrated by: Mark Boyett

When Earth's colonies go silent, Legion Varus drops onto Kepler-62 expecting a routine investigation. Instead, they find something far worse than death.

The colonists aren't dead—they're changed. A new kind of enemy has arrived in Province 921, microscopic invaders that transform humans into perfectly coordinated killing machines. These "Demon" parasites don't just control minds; they improve them, creating an army that works with terrifying efficiency.

As cities fall and soldiers turn against their own, Centurion James McGill discovers he's mysteriously immune to infection. But immunity comes with a price. To save humanity from becoming pawns of a new Galactic species, McGill must navigate a web of seduction, betrayal, and impossible choices.

Some invasions come with warships. Others come with a whisper, a touch, and a promise of something better. The question is: what happens when the enemy might be right?

Demon World is an action-packed entry in B.V. Larson's bestselling Undying Mercenaries series.

©2025 Iron Tower Press, Inc. (P)2025 Podium Audio

Great installment. Setup for future books.

I’ve enjoyed the whole series of 24 books. I really appreciate the author can actually complete a story while setting the stage for the next book WITHOUT leaving us readers on a stupid cliffhanger. Looking forward to the next book- hopefully sooner rather than later——and in Audiobook format! The audiobook narrator does an excellent job of bringing the story to life while I complete my long commute to/from work.

Best yet

Just got done with it. This book was well written and mark boyett… all I can say is well done…excellently well done. This book keeps you interest and its leading up to something very big in the next book or two. Don’t hesitate to buy this book. You’ll definitely not regret it.

Love James McGill!

I have read the 1st two volumes of Undying Mercenaries and listened to all of the Audiobooks. I am solidly hooked on the audios! Just acknowledging the fact as long as you keep writing and recording this series I will buy and listen. Those who have never experienced this series need to jump on now. Thank you for this.

Even though this is several books into the series

The narrator is amazing. He always keeps his characters fresh. I'm really impressed that so far into the series. I still get a surprise or two. This is a great addition to the series.

immediately began listening as soon as available

I think its Larson's best so far--but then I say that after every book in the series. The McGill creature is the best character in Military Sci Fi. I can't imagine a better narrator than Mark Boyett. He sounds like he's enjoying the book as much as me!