The Passage of Power, the fourth book in Robert A. Caro's The Years of Lyndon Johnson series, published May 1 by Knopf, is #8 on the Amazon bestseller list and #51 on the Kindle bestseller list, as of the morning of May 1. The series has sold over one million copies and Caro has received two National Book Critics Circle Awards, a National Book Award, and a Pulitzer Prize. The other books are also seeing a bump in sales, and all of them are in the top 500.