When the cats are home alone, thieves attempt to rob a house in the neighborhood. But these are not ordinary thieves – they are the wives of the thieves from Book 2. How can the cats defend the house? Then their adventure takes them to the Internet, where a Prehistoric Mouse, called Trambambu plans to transform every cat into a rat. And unfortunately she has found a way to do this. Landing in Ratanada where Trambambu rules the land, Rascal and his friends face dragons, saber-toothed cats from the past and other historic creatures. Can Rascal save his friends from the Prehistoric Mouse? Can all of them return to their home in Catanada?