Puffin Little Badman and the Time-travelling Teacher of Doom

They've faced deadly alien slugs, killer aunties and double maths. Now, Humza Kahn (and his friend Umer, I guess) face something even scarier - Humza's dad! And he's fed up with the boys acting up all the time. So he's sending them away to a special summer school in Pakistan. But here the two friends are about to learn that something very weird indeed is going on - someone has been messing with time! The world may just need saving again . . .