A hilarious, swashbuckling adventure for siblings everywhere! When George inherits a mansion from old Mrs Smallbone, he realises it isn't your average mansion. It's full of fascinating tenants like Boris the dog, an unusual pastry chef who lives in the basement, a mysterious scientist who works in the attic, and lots and lots of chickens!
Percy's mum has invented a machine that changes DNA to bring extinct species back to life. And when the scientist next door suddenly turns into a talking rat, Percy is roped into a hilarious adventure in which everyone seems to want to get their hands on the species machine - and Percy comes to appreciate what his activist parents are fighting for.