With filthy hair all over his face and horrid plots growing in his mind, Mr Twit is one of the nastiest people you'll ever meet and Mrs Twit is just as bad and even uglier! But they don't stop at tricking each other: neighbouring children and even the local birds are in danger, and that's where the Muggle-Wumps come in. This family of monkeys has had enough of the Twits' tricks and, with the help of the handsome Roly-Poly Bird, they decide it's time for sweet revenge...