Alone in the world, Elspeth Swansome takes up the position of nanny on a remote Scottish island.

Her charge, Mary, is distracted, secretive - and hasn't uttered a word since the death of her twin, William, just days after their former nanny disappeared.

No one can say what happened to William. Just as no one can explain the lullabies sung in empty corridors. Nor the whistling that comes in the night...

Winter draws in. Passage to the mainland becomes impossible. Elspeth finds herself trapped.

But is this house haunted by the ghosts of the past?

OR THE SECRETS OF THE LIVING..?