An eight-year-old boy solves mysteries with the ghost of his former class pet, a naked mole rat, in this funny supernatural graphic novel series for early readers.It’s Field Day at Creek Elementary, but Carter can't focus on the relay race or water balloon toss because Lester’s pet rock Rocky is missing! Carter and Mr. Pebbles are on the case in this third installment of the Class Pet Ghost Detective series.Don’t miss the other books in the series: What Happened to the Naked Mole Rat? and Milkshake the Disappearing Milk Snake.