Brave, clever and never more than a whisker away from adventure! When the museum's visitors are gone for the day, it's time for the cats to come out to play... The kittens can't wait for the museum's first ever sleepover! Especially Bianca, who loves being fussed over. So much so that when she goes missing, the others worry that she may have run away with the children. But the rats have also been sniffing around the school party. Could the kittens' old enemies be the ones behind Bianca's disappe ...