A woman arrives at a hospital in County Mayo. At first, she won’t speak. Then she reveals her name: Ruth.

A story starts pouring out – about a missing friend and her paranoid behaviour in the days before she disappeared. The two women were staying together in a rented clifftop house, but there’s blood on the floor and locals say they never saw the pair together.

Ruth’s story makes sense, if you want to believe her.

But someone is dead, someone is a killer, someone is lying. Can Ruth’s version unlock the truth, or are the answers in everything she didn’t say?