"It's that alligator... Dad should never have brought it into the house. Crunchbag has escaped and he's eaten Granny!"
Some dads bring home rabbits. Or dogs. Or parrots. Not Nicholas's dad. The latest member of their family is Crunchbag - the ALLIGATOR! Soon he's running riot in the bathroom and on the roof and even in the park! But he wouldn't eat poor defenceless Granny... would he?