Adèle and her daughter Sarah are traveling on the Welsh coastline to see her husband James when Sarah disappears. A different but similar looking girl appears who says she died in a past time. Adèle tries to discover what happened to her daughter as she is tormented by Celtic mythology from the past.
In mourning over the tragic drowning of their daughter Sarah, James and Adèle are visited by Ebrill, a young girl who claims she died 60 years ago - and bears a startling resemblance to Sarah.