Although heinous crimes often go unsolved in real life, that's never the case in fiction. Well, almost never. In Susan Hill's pensive mystery, Detective Chief Inspector Simon Serrailler — called back to his English cathedral town from a Venetian vacation — can't figure out who abducted a small boy, even after months of painstaking police work. He's also consumed with worry for his two sisters, one severely disabled, the other pregnant. And worse still, he's being stalked by a crazy ex-girlfriend. Hill is a fine writer, and, despite the lack of a crash-bang finale, The Pure in Heart ends on a brooding, downright ominous note. A-