He was a riverboat pilot, reporter, penniless prospector, Civil War dropout, would-be entrepreneur, loving family man, world traveler, pomposity buster and raconteur. It turns out the man who created adventures for Tom Sawyer, Huckleberry Finn and a Connecticut Yankee led a mighty adventurous life himself. "Truth is a very valuable thing," says Fredric March's Mark Twain. "I believe we should be economical with it." And that sets the tone for what follows: a lovingly crafted Hollywood biopic tracing the immortal humorist's life from Hannibal boyhood to Big River exploits to global literary lion and more. Riverboat's a-comin', hop aboard - with Tom, Huck, Jim and above all, Samuel Langhorne Clemens.