Marcus Whitman was a missionary in the 19th century who played an important role in the development of the American West. He and his wife, Narcissa Whitman, have been revered since perishing in an 1847 Indian attack. But the story isn’t what it seems. Blaine Harden tells the startling account as he expounds on his latest book, Murder at the Mission: A Frontier Killing, Its Legacy of Lies, and the Taking of the American West.