Another hilarious adventure from two "New York Times"-bestselling authors. When a night at the museum finds Hoover coming face to face with the ghost of a powerful Chumash Indian 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.

HENRY WINKLER is admired by audiences of all ages for his roles as the Fonz on the long-running series, Happy Days, and in such films as Holes and The Waterboy. He is also an award-winning producer and director of family and children's programming, and the author (with Lin Oliver) of the critically-acclaimed Hank Zipzer series. He lives in Los Angeles, California.

Lin Oliver is a television producer and writer and the Executive Director of the Society of Children's Book Writers and Illustrators. She coauthored (with Henry Winkler) the NEW YORK TIMES bestselling middle-grade series HANK ZIPZER: THE WORLD'S GREATEST UNDERACHIEVER, and wrote the series WHO SHRUNK DANIEL FUNK? Lin resides in Los Angeles, California.