Isaac and his two friends, Anna and Filip, have made a mega-speaker to impress Mr Woolly in Science Club. But when they see some of Dr Waste's giant toxic bats taking their bikes and Mr Woolly's car from the school playground, they must use the mega-speaker to try to stop them.This book is from Readerful's Independent Library. It is for children aged 7 to 8 to read without support. Readerful is a reading library specially designed to motivate children to read more. The series offers contemporary, inclusive books for children from 4 to 11 years, including: Books for Sharing: picture books to be read aloud by an adult for inspiring reading sessionsIndependent Library: fiction, graphic texts, character mini-series and non-fiction for children to read independentlyRise: fully decodable books for older struggling readers to read independently.How Readerful works: - Read aloud the Books for Sharing for magical reading sessions that motivate children to read more. - Then encourage children to choose a book to read by themselves, from Readerful's Independent Library or from Rise. You'll find links between the books' topics, vocabulary, characters and authors - all designed to keep children reading, boost their vocabulary and develop their knowledge of the world around them.