Summary Influence: How to Exert It is a 1916 self-help classic with a literary mystery at its center. The book was published under the name "Yoritomo-Tashi" — presented to readers as the wisdom of a great Japanese Shogun — but scholars have since established that "Yoritomo-Tashi" was actually a fictional persona created by a French woman named Berthe Blanchard, who used "B. Dangennes" as one of her pseudonyms. Whether the book's argument came from a 12th-century statesman or