The Darwin Lacroix Adventures
The history is real. The danger is fiction. Mostly.
Thrillers grounded in real history and real science. Ten Darwin Lacroix adventures and counting.
A Zac Johnson Thriller · Book 1
Threshold State
1 Nov 2026
She hears the world. But who’s listening to her?
The next President of the United States can outthink everyone in the room. The only question that matters is whether the thoughts are her own.
The Darwin Lacroix Adventures
Some things are kept locked away for a reason. Darwin opens them anyway.
New to Darwin Lacroix? Start with Roman Ice, the book that launched the series.
Meet Dave Bartell
Dave Bartell writes thrillers grounded in real history and science. The places are real. The artifacts are real. The danger is where fiction starts.