THE EXCHANGE OF JOY (250 pp.)Isabel QuiglyHarcourt, Brace ($3.50).
The damage starts when Neddy tender considerate husband and rising young English architect, signs up for a 13-month job in Australia and packs Celia and the kids off to Forte dei Marmi on the Italian Riviera. There, at the beginning of a sun-soaked Italian summer, she meets the aging principessa and the principessa's current lover, Arcangelo, though Celia is too innocent to recognize him as such. She is quicker to sense the unsettling effects of the Italians upon her tidy and hitherto strait-laced life. She tries to tell the children's nanny about...