Nobody moves to the remote Scottish island of Bancree, and few leave - but leaving is exactly what seventeen-year-old Flo intends to do. So when a mysterious man and his daughter arrive at isolated Dog Cottage, Flo is curious. Who would willingly choose to live in such solitude? The man's brooding handsomeness is extraordinary; and there's something unusual about his daughter Ailsa that Flo cannot help but be drawn towards. But people aren't only arriving on Bancree, they are disappearing too. Reports of missing islanders fill the press, and when a body washes ashore, suspicion turns to the strange new outsiders. Convinced of their innocence, Flo is fiercely determined to protect her friend. Could the answer to the disappearances, and to the overwhelming pull of her own heart, lie out there, beyond the waves?