Pashki: the ancient Egyptian art of moving like a cat. The Cat Kin: London's most unusual after-school club. The Cat Kin are not the only ones with extraordinary skills. Ben Gallagher has stumbled on a far more sinister gang, ruled over by a man with a horrific past. Deep beneath the city streets hides the deadly secret that Ben and Tiffany must uncover – but can the evil be stopped in time? Even with the help of their remarkable new teacher Geoff White, no-one can hope to escape unscathed when cat meets polecat...

Everyone who came to the strange gym class was looking for something else. What they found was the mysterious Mrs Powell and Pashki, a lost art from an age when cats were worshipped as gods. Ben and Tiffany wonder: who is their eccentric old teacher? What does she really want with them? And why are they suddenly able to see in the dark? Meanwhile, in London's gloomy streets, human vermin are stirring. Ben and Tiffany may soon be glad of their new gifts. But against men whose cunning is matched only by their unspeakable cruelty, will even nine lives be enough?