Olivia Langdon Clemens was not only the love of Mark Twain's life and the mother of his children, she was also his editor, muse, critic and trusted advisor. She read his letters and speeches. He relied on her judgment on his writing, and readily admitted that she not only edited his work, but also edited his public persona. Until now, little has been known about Livy's crucial place in Twain's life. In Resa Willis's affecting and fascinating biography, we meet a dignified, optimistic woman who married young, raised three sons and a daughter, endured myriad health problems and money woes and...