'This book dances with sunlight and colour, faded patinas and shifting standards, with humour and knowledge making easy companions' Mail on Sunday The monastery of San Giovanni has few treasures -- only a painting doubtfully attributed to Caravaggio. So Flavia di Stefano of Rome's Art Squad is surprised to receive a tip-off that a raid is being planned. The raid happens, but the thieves are disturbed and snatch the wrong painting, a curious icon of the Madonna, remarkable only for the affection