In Grandma's house there's a catflap, with some very strange symbols drawn on it. and it's much bigger than normal. But what's really strange is that Grandma doesn't have a cat.

Na casa da avó tem uma caixa de gato. Ela tem alguns símbolos estranhos desenhados. E é maior do que o normal. Mas o mais curioso é que a avó nunca teve gatos.

Sara's dangerous hobby of breaking into abandoned buildings has allowed her to get to know  Álex and  Ray, a couple of young adventurers.

Inside every city exist other invisible cities. the Mopa clan live a hidden existence on the rooftops of the huge buildings in the middle of the city.