Mangrove Publishing

Tech. Truth. Story.

Geopolitical tech-thrillers, cold-case mysteries, field guides, and historical fiction — all built on science fact, technical accuracy, and real experience.

Dark Recipe by Robert Cummer
Available Now — Free on Kindle Unlimited

Dark Recipe

A Knox Ramsey Thriller

When a controlled-environment agriculture system is weaponized, one engineer discovers the science is real, the threat is global, and the people who built it will kill to keep it quiet.

In the News

WNEM TV5 — Saginaw, MI

Author Robert Cummer discusses Dark Recipe and why he started writing · Feb 20, 2026

Watch the Interview →

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Sample pages from the catalog

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Every story is engineered from fact

30+

years in industrial automation, process control, and field engineering

2

patents in advanced measurement systems

0

pages of theory. Real problems. Real systems. Real stakes.

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