Cosmo the kitten is in trouble. He's taken Mega Merle's costume and now the Gerbilator is after him. He needs Mega Merle, but can Merle save the day without his costume? Readerful is designed to motivate children to read more. This Independent Library book is for pupils aged 6 to 7 in Y2/P3 at Oxford Reading Level 12 to read without support.