A famed American author, Sophie, who travels to Scotland and finds herself wanting to buy a castle, but the prickly owner, a Scottish Duke named Myles, is reluctant to sell to a foreigner.
On leave in a shore side town, Johnny becomes interested in a young dark haired woman. They meet and he learns that she plays a mermaid in the local carnival. After strange occurrences, Johnny begins to believe that she may actually be a real mermaid that habitually kills during the cycle of the full moon.
