For a long while, Val McDermid's bread-and-buttter was the world of serial killer stories. McDermid's Tony Hill series often featured a killer on the loose; there was a ticking clock; yadda yadda yadda. At a certain point, McDermid began to pursue a different kind of story, the cold-case story. This was through her Karen Pirie series. Cold-case narratives are a nice way of steering around one problem of a serial killer narrative. Serial killers can become dull and repetitive; I began to sense this in the Tony Hill stories. Is it conceivable that there are *not* inexhaustible options for making a crazed "spree killer" seem interesting? With a cold case, it's possible that someone committed one terrible crime--then chose to "self-correct." But failing to acknowledge the crime is a kind of societal disease. It's a disease because victims of the crime may still be trying to live their lives; they have "ingested" the idea that someone can terro...