Leaving behind his Boston childhood, Benjamin Franklin reinvents himself in Philadelphia where he builds a printing empire and a new life with his wife Deborah. Turning to science, Franklin gains worldwide fame from his lightning rod and experiments in electricity. After entering politics, he spends years in London trying to keep Britain and America together as his own family starts to come apart.

Benjamin Franklin leaves London and returns to wartime Philadelphia where he joins Congress and helps Thomas Jefferson craft the Declaration of Independence. In Paris, he wins French support for the American Revolution then negotiates a peace treaty with Britain. He spends his last years in the new United States, working on the Constitution and unsuccessfully promoting the abolition of slavery.