The Tale of the Two Black Cats Who Tried to Run Away

Penny is a brave little cat, always up for an adventure. Her brother, Pip, is rather nervous and can be a bit silly. He looks permanently astonished and tends to get into scraps, the two of them hatch a plot to escape from their cat basket on the way to the vets. What will happen on their adventure? Have they bitten off more than they can chew?