Reign of Secrets, a historical diplomatic thriller by James P. Cain blending espionage, Viking secrets, royal intrigue, and global geopolitics.

Reign of Secrets

Diplomatic Thriller Novel

A murdered prince.
An ancient pact forged in 1027 AD.
A Russian President determined to reclaim an empire.

Perfect for fans of Dan Brown, Steve Berry, Tom Clancy, and Brad Thor, Reign of Secrets is a gripping blend of history, action, and modern political threat—rooted in real-world diplomacy and high-level national security insight.

In Reign of Secrets, former U.S. Ambassador James P. Cain delivers a razor-sharp diplomatic thriller blending modern espionage with ancient European intrigue.

When Prince Axel of Denmark is murdered off the coast of Florida, American attaché Colonel Whit Ransom is pulled from the quiet world of diplomacy back into the deadly world of special operations. Partnered with Irish attaché Aisling “Ash” Kelly, Ransom uncovers a hidden pact forged in 1027 AD between Pope John XIX and King Canute—an arrangement that secured a millennium of royal stability in Denmark…and concealed a secret powerful enough to reshape Europe.

Now, Vladimir Putin believes that secret is the key to restoring the Russian Empire. As Whit and Ash race across Copenhagen, Rome, and St. Petersburg, they confront assassins, rogue agents, and a geopolitical conspiracy stretching from the Viking Age to today’s most dangerous corridors of power.

Genres: Diplomatic Thriller, Historical Fiction Thriller, Geopolitical Suspense, Royal Intrigue
“Ambassador Cain captures the mindset of a Delta Force operator with extraordinary accuracy. A gripping, timely thriller where Whit Ransom feels as real as the men I’ve served beside.” ~ Lt. Col. James Reese, US Army (Ret.), Delta Force Operator