Fourth in the hilarious new series for young readers from Henry Winkler and Lin Oliver Billy Broccoli is used to getting expert advice - wanted or not - from the ghost with the most, Hoover Porterhouse. The Hoove has smooth moves and a silver tongue ... and he isn't shy about sharing his words of wisdom! But when a night at the museum finds Hoover face-to-face with the ghost of a powerful princess, his brain turns into mashed potatoes. Now the tables are turned and it's up to Billy to help Hoover find the words he needs to make a new friend.