Secret coders

There's something lurking beneath the surface of Stately Academy - literally. In a secret underground classroom, Hopper, Eni, and Josh discover that the campus was once home to the Bee School, an institute where teachers, students, and robots worked together to unravel the mysteries of coding. Hopper and her friends are eager to follow in this tradition and become top-rate coders. But why are Principal Dean and the rugby team suddenly so interested in their extracurricular activities?.

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. Dr. One-Zero, once a star pupil, is now a green-skinned villain on the hunt for the most powerful turtle in the world. It's up to the coders to stop him.