Cora Harrison's new mystery novel "My Lady Judge" revolves around a 16th-century judge, named Mara and is set in western Ireland. Mara is forced to abandon her usual practice of settling local squabbles when one of her assistants is assaulted with a knife during a colorful festival. "My Lady Judge" is a highly readable mystery based on the actual Brehon Law system which did allow so-called "lady judges." ($24.95 / 368 pages / St. Martin's)