Roslander is the book about a couple, Frank and Agatha. They were stranded on an island for five years, where they meet some unusual creatures-a clan of merbeings (mermaids and mermen). They learn to live with the merbeings in harmony. They also learn many other secrets and the history of the merbeings. Agatha keeps a journal of the five years and the information they learn while they are on the island. There are all kinds of adventures and discoveries throughout the book.