When Sarah drowns off the rocky coast of Wales, James (Sean Bean, THE LORD OF THE RINGS) and Adèle (Maria Bello, A HISTORY OF VIOLENCE) search in vain for their child's missing body. So when a mysterious young girl tells her she's looking in the wrong place, Adèle recalls a legend about THE DARK, the Celtic land of the dead. Haunted by ghastly visions of Sarah pleading for help, Adèle becomes convinced of the legend's truth. And as James watches in horror, Adèle embarks on a journey beyond madness as she invokes the ancient rule of return: one of the living for one of the dead.