Fayson and her friends are back together and ready for their toughest case yet - someone is sending anonymous emails accusing the detective agency of being a nuisance to the island! But when they discover an abandoned boat with two wet lifejackets on board, they know they have a new mystery to solve. As strange things start happening on the island, with books and video games vanishing and a suspicious figure lurking around at night, Di Island Crew must use all their smarts to uncover the truth. Can they crack the case and save the detective agency, or will they be forced to close down for good?