Forensics expert Ruth Galloway is called in to investigate when builders, demolishing a large old house in Norwich to make way for a new development, uncover the skeleton of a child - minus the skull - beneath a doorway. Is it some ritual sacrifice or just plain straightforward murder? DCI Harry Nelson must find out.

The house was once a children's home. Nelson meets the Catholic priest who used to run the home. He tells him that two children did go missing forty years before - a boy and a girl. They were never found.

When carbon dating proves that the child's bones predate the children's home, Ruth is drawn more deeply into the case. But as spring turns to summer it becomes clear that someone is trying very hard to put her off the scent by frightening her half to death...