Fire Fall announcement

Former U.S. Air Force fighter pilot and Tom Clancy Rules of Engagement author Ward Larsen is reuniting with #1 New York Times bestselling author Brad Thor for a chilling new thriller rooted in one of the darkest secrets of World War II, titled Fire Fall. Scheduled for publication on January 5, 2027 by Atria/Emily Bestler Books, Fire Fall marks their second joint release following their collaboration on Cold Zero.

As World War II ended, one of its most terrifying weapons had yet to be unleashed.

When two American archaeologists vanish while live-streaming an expedition deep in the jungles of Indonesia’s Halmahera Island, their final footage triggers a classified U.S. intelligence alert dormant since 1945.

DIA bioweapons expert Dr. Sara Taylor and CIA operative Alex Ross are sent to investigate. What they uncover is no ordinary ruin, but a sealed WWII-era installation tied to Imperial Japan’s notorious Unit 731, a top-secret Nazi scientific program, and a forbidden series of wartime experiments erased from history.

But before Sara and Alex can determine what they’re dealing with, the site is breached by a powerful organization operating beyond the reach of any government – one intent on reshaping the global balance of power on its own terms.

What begins as a mission to rescue two missing Americans quickly becomes a race to stop a weapon hidden at the end of World War II from bringing civilization to its knees.

Cold Zero was a terrific success, the partnership of Larsen and Thor proving to be the right mix of ingredients. In Fire Fall, they look set to deliver the same again, possibly even more.

Fire Fall breakdown

The choice of Halmahera Island and Imperial Japan’s Unit 731 gives the plot a distinct historical backbone to Fire Fall. Halmahera was a heavily fortified base in the Moluccas during World War II, making it a believable location for a forgotten, isolated installation. Readers can likely expect a narrative that begins almost as a forensic mystery before accelerating into a tactical confrontation. Blending real-world WWII atrocities with modern biological warfare risks allows Larsen and Thor to build a story that feels research-heavy and credible rather than overly exaggerated.

Looking at the setup for Fire Fall, the book seems tailored to highlight Ward Larsen’s talent for technical tradecraft and balanced character pairings. Pairing a DIA bioweapons expert with a CIA operative mirrors the layered approach Larsen brought to his David Slaton series, as well as Cold Zero. Dr. Sara Taylor brings the specialized scientific lens needed to decipher complex biological threats, while Alex Ross provides the fieldcraft and tactical muscle. For readers who enjoy procedural authenticity, this dynamic promises a sharp balance between scientific analysis and field operations.

Rather than relying strictly on standard nation-state tensions, the threat in Fire Fall comes from a non-state shadow organization intent on shifting global power. This setup fits right into Larsen’s comfort zone. His solo novels frequently excel when dealing with rogue factions, hidden agendas, and operatives forced to improvise when standard protocol breaks down. Combined with Thor’s signature relentless pacing, Fire Fall looks poised to deliver a tight mix of intelligence tradecraft, dark historical secrets, and realistic global risk.

For readers looking into the real-world history behind Fire Fall, Unit 731 was the Imperial Japanese Army’s top-secret biological and chemical warfare research division. Operating from the mid-1930s until the end of World War II under the command of Surgeon General Shirō Ishii, it represents one of the most guarded secrets of wartime military science.

• Human Experimentation: Officially designated as the “Epidemic Prevention and Water Supply Department,” the unit conducted biological warfare tests on thousands of human subjects at its primary complex in Pingfan, Manchuria, along with satellite field stations across occupied territory. Test subjects were deliberately infected with lethal pathogens, including bubonic plague, cholera, anthrax, and typhoid.
• Operational Deployment: Beyond laboratory testing, Unit 731 developed field delivery systems, including ceramic bombs engineered to disperse plague-infested fleas, and deployed biological agents against civilian populations and water sources in China.
• The 1945 Intelligence Bargain: As Soviet and American forces closed in during August 1945, Japanese personnel attempted to demolish the facilities and destroy records. Following Japan’s surrender, the U.S. government secretly granted General Ishii and senior scientists immunity from war crimes prosecution in exchange for their exclusive biological research data and test findings.

PreOrder

Fire Fall is available to preorder now and will be published January 5, 2027.