When the body of four-year-old John Vincent is discovered, hidden in a midden, the already unhappy Cornwall family begins to unravel.
With no obvious reason for his murder, a scapegoat must be found andhis elder half-sister Charlotte, the sleepwalker, neatly fits the bill.
After facing the horror of a trial by jury, Charlotte is found not guilty but suspicion still follows her asshe takes up almost unpaid work as a teacher in the untrustworthy Mrs.
Armitage's school.
After her fellow teacher and friend, Miss Lamb, vanishes, followed by the tragic death of one of Charlotte's much-loved pupils, the finger of blame is pointed again.
Now even Charlotte begins tobelieve that she is losing her mind and may well be a murderess.