National Treasure 3: Legacy of the Lost Republic (2026)
Nicolas Cage, Justin Bartha, Diane Kruger, Helen Mirren, Ed Harris (cameo)
The hunt for truth returns — and this time, it reaches deeper into America’s foundations than ever before.
In National Treasure 3: Legacy of the Lost Republic, historian-adventurer Benjamin Franklin Gates (Nicolas Cage) uncovers a mystery that threatens to transform everything the world believes about the Civil War, the Founding Fathers, and the very blueprint of the United States government.
The adventure ignites when archaeologists recover a sealed Civil War–era treaty from beneath a collapsed Union fort. Inside lies a cipher written in two distinct codes — one ancient, one modern — both bearing the unmistakable signature of a secretive faction lost to history: The Silent Republic. Rumored to be a hidden council formed by a splinter group of Founders, the Silent Republic created contingency plans meant to guide America through its darkest hours… plans so radical they were erased from all official records.
Ben soon discovers that the final key to deciphering the Silent Republic’s greatest secret lies not in dusty archives, but in his own lineage. His family’s past — from Thomas Gates’ fateful encounter with the Booth diary to cryptic journals passed down generations — becomes central to uncovering a conspiracy stretching back to the Revolution.
Reuniting with Abigail Chase (Diane Kruger) and tech-genius Riley Poole (Justin Bartha), Ben embarks on a cross-country quest that leads them through:
- Hidden chambers beneath Civil War battlegrounds
- Subterranean cities built beneath early American capitals
- Encryption-laced presidential archives no outsider has ever accessed
- A forgotten coastal fortress rumored to house the Silent Republic’s final vault
But shadowing their every move is a ruthless billionaire antiquities hunter with global ambitions. When this adversary uncovers fragments of the Silent Republic’s failsafe — a device engineered to manipulate political systems through economic and informational control — the race transforms into a battle to prevent a worldwide cascade of destabilization.
As Ben decodes the last layers of the Silent Republic’s master plan, he realizes that the Founders never intended the secret to be used — only to be protected. Its misuse could fracture nations, collapse alliances, and alter the balance of power across the globe.
With Helen Mirren returning as Emily Appleton and a surprise Ed Harris cameo tying back to Book of Secrets, the film blends family legacy with national mystery, weaving history, myth, and action into a full-throttle treasure hunt.
Fast-paced, intricately plotted, and brimming with clever riddles, death-defying escapes, and old-school Gates ingenuity, Legacy of the Lost Republic delivers the spirit of the original films at a massive new scale — reminding audiences that for Benjamin Gates, every clue matters, every symbol hides a story, and every treasure changes the world.