Mystery of the Green Cat

With its black eyes, the creature looks at the four children, mysteriously wise, mysteriously alive...."What is the secret of the green cat? Why does it mean so much to the strange people who live next door?Why is the old baroness kept a prisoner there in the gloomy old mansion?Andy and his twin brother are having a hard time getting used to their new stepsisters. But on one thing the four of them agree: they are determined to find the mysterious china cat and learn its sinister secret