A girl seemingly drowns while visiting a remote area of Wales - but her mother becomes convinced she is actually trapped in a shadowy alternative reality enshrined in local mythology, and vows to do whatever it takes to rescue her. Atmospheric horror, starring Maria Bello, Sean Bean, Richard Elfyn and Maurice Roeves.

In an attempt to pull her family together, Adèlle travels with her young daughter Sarah to Wales to visit her father. The morning after they arrive, Sarah mysteriously vanishes in the ocean. Not long after, a little girl bearing a striking resemblance to their missing daughter reveals that she has retuned from the dead — and that Sarah has been taken to the Welsh underworld.