Breath of Brimstone — Anthea Fraser

Innocent enough -- an inscription in a child's autograph book, a token from her new music teacher, Lucas Todd, that had charmed the six-year-old Lucy. But in Celia, Lucy's mother, it had struck a chill of unease. They had been thirteen at the table that day -- a foolish superstition that had preyed strangely on Celia's mind. That night she had been disturbed by vivid and sinister dreams of Lucas Todd... After that, Celia lived in a nightmare of nameless dread -- watching something change her happy, gentle child into a monster of evil...