In the Welsh folk-horror “Rabbit Trap,” debuting director Bryn Chainey creates an disquieting acoustic atmosphere and guides his trio of actors to powerful performances. However, these flourishes serve a muddled piece that coasts on its interpretability alone.

There’s no microphone in the world strong enough to pick up a person’s deepest secrets, and yet every time Darcy (a compellingly anxious Dev Patel) takes his sound equipment for a wander around the primordial Welsh countryside,