Just in case you thought that the cops' side of the story has still not been put forth sufficiently, here is a novel about the NYPD written by two captains of the ""finest,"" one of whom, Foran, was called before the Knapp Commission but subsequently was cleared. To their credit they manage to give us many different kinds of cops with their day-to-day routines. There is Shields, whose zeal as a corruption hunter has a lot to do with the fortune he himself accumulated from the gambling pads; Boland, an ordinary guy whose reluctance to draw his gun cost him his life; Foy, an honest man whose reputation is besmirched by false charges of police brutality. It is their enemies who are too bad to be true -- the informer who not only has to be Judas but a homosexual too; a weasel-like City Hall aide; a corrupt liaison to the black community. But the main enemy is ""political interference"" and that's a story we've heard all too often already. The authors' one-dimensional presentation is not likely to change anyone's mind either.