Jake's class finally has the best teacher in the whole world, Mr Hyde. He doesn't make them clean toilet bowls with toothbrushes and his lessons are always fun. There is just one teeny, tiny, HUGE problem. Mr Hyde transforms into a naughty, little creature whenever he becomes upset. The creature has some amazing abilities but being well-behaved isn't one of them! Jake's class will have to use all their ingenuity to hide the creature, so they can keep their brilliant teacher. But Mrs Blunt, their headmistress, is never far off the scent . . .