Enter a world of wonder with an instant classic from comedian, actor and bestselling children's author, Ben Miller! Harrison tries his best to be good. He doesn't steal, he always shares with his sister and he never cheats at board games, but Harrison also has a BIG flaw . . . He can't control his temper!

So when he's given a black hole instead of a balloon at a party, Harrison jumps at the chance to get rid of everything that makes him cross. But when it's not just things he hates that are disappearing into the black hole but things he loves, too, Harrison starts to realize that sometimes you should be careful what you wish for...