Secrets Beneath the Sea by Janet Gurtler. Like most 12-year-old girls, Shyanna, Rachel, and Cora deal with the daily dramas of growing up. Unlike most 12-year-old girls, they deal with it underwater as mermaids. The allure of life on land is a constant presence in the life of a mermaid, and friendships are tested with secrets, lies, and jealousy. The magical and mysterious world of mermaids is brought to life in Mermaid Kingdom.