20/04/2019: Richard Feynman’s letter to his late wife, the intercepted appeal from Gandhi to Hitler to stop WWII, and F. Scott Fitzgerald’s honest feedback to an aspiring writer: all excellent letters, but which is better and why? What makes a good letter in the first place? Thomas Billinghurst, Hananah Zaheer and Rachel Hamilton go head to head in this week’s Book Off to debate which of the letters they have brought to defend is the best, and why we should care about them in a convenient world of gifs and email in the first place.