Gema Delgado

this book is for all that have sisters and they are means

Two girls enter a black hole and transform into mermaids and princesses. They encounter a thief, while another group of children explores the black hole and faces spooky adventures.

On the planet Robit, robots play and build towers until two evil robots arrive. The Robits fight back, defeat the robots, and make peace with them. But when a human threatens them, they capture him and live in peace.