Shelby and Wade are staying with Gran in her lighthouse for the summer. They soon find out that Gran has an amazing secret - she comes from a city under the sea! Together, the three of them must go on an underwater adventure to thwart the plans of Captain Pincer, who is trying to steal treasure and destroy a shipwreck in Portside Bay. 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 sessions Independent Library: fiction, graphic texts, character mini-series and non-fiction for children to read independently Rise: 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.