Lucky number 13 in the Marshal Salvatore Guarnaccia series, rich in the flavor of Florence, involving the murder of a woman in Boboli Gardens. The Columbo of Italy, Nabb's likeable Guarnaccia, a Sicilian living in Florence, is not entirely at ease, but he's deceptively clever (and a solid citizen). Nabb helpfully includes a map of Florence.  (ITL634, $12.00)