Volume 3 in the mind-bending new series from Gene Luen Yang! Hopper never dreamed that there was a connection between the Bee School and her missing father -- but it turns out that Albert Gracie was also a student of this mysterious coding school. His disappearance can only be the work of Dr. One-Zero. Once a star pupil of the Bee School, Dr. One-Zero is now a green-skinned villain on the hunt for "the most powerful turtle in the world." And the coders may be the only ones who can stop him. - Back cover.