In this book, Granphibian is suspicious about Captain Pincer's latest get-rich-quick scheme: selling pearls. Are the pearls real? Why is Pincer visiting Seal Island? Granphibian, Wade and Shelby are on the case. Granphibian and the Seal Island Rescue is at Oxford Reading Level 10. It is for readers aged 7 to 11 years old who are working below expected standard in their reading. The Readerful Rise series ensures that older struggling readers have books with age-appropriate content and topics, that look like the books their peers are enjoying, but are written at a level they can read successfully.