Would you agree to go on a perilous TOP SECRET mission to save your best friend from the creaking gibbet?Mabel Jones is on her way to the city of Otom in search of the legendary Doomsday Book - an ancient document that might help her save the hooman race.But Otom is a dangerous place, packed with soldiers, spies and stinking rebels. Can Mabel escape with the book, or will she fall victim to the dreaded Grand Zhoul . . . ?The third adventure in the hilarious Mabel Jones series, written by Will Mabbitt and illustrated by Ross Collins.