Although primarily an academic, British writer MR James was a master of the ghost story.

In it, a Cambridge professor discovers an old whistle near a deserted beach.

Walking back to his hotel, he notices a figure emerging from the hazy distance.

Like all great ghost tales, it seems to hover on the boundary between nightmare and reality.

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The openings a great tone-setter.

the father says, as the girl leaps into a car and skitters away at top speed.

Later, on a lonely beach, the girl cowers, seemingly resigned to the fate which awaits her.

I was followed by a monster, and I instinctively knew it was bad, the writer-director told us.

It was very slow, and it was always coming towards me.

It would walk towards me when I was with friends or family, at all different times.

Id have to run away, or climb out of a window, or run down the street.

It was just this constant feeling of dread and anxiety.

That was obviously much later, when I put that altogether.

But the basic idea was in the back of my head for a long time.