THE NAIVE AND SENTIMENTAL LOVER
by JOHN LE CARR£
455 pages. Knopf. $7.95.
Not much doubt about it: John le Carre will one day be spoken of as a novelist who once wrote some good spy stories. But not just yet. Right now he is probably in for a series of sermonettes advising him that The Spy Who Came In from the Cold was all very well, but writing real novels is a serious business.
His new book is a comic novel with decent depth to it and not an upturned raincoat collar in sight. Its...