HOLBROOK/TWAIN: AN AMERICAN ODYSSEY chronicles the triumphant and tumultuous history of the longest-running one-man show in the history of theatre, Hal Holbrook's Tony and Emmy Award-winning masterpiece, "Mark Twain Tonight!"HOLBROOK/TWAIN: AN AMERICAN ODYSSEY chronicles the triumphant and tumultuous history of the longest-running one-man show in the history of theatre, Hal Holbrook's Tony and Emmy Award-winning masterpiece, \"Mark Twain Tonight!\"