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. It has some amazing abilities but being well-behaved isn't one of them! Jake's class have to use all their ingenuity to hide the creature, so they can keep their brilliant teacher. But heistress Mrs Blunt is never far off the scent...