Nancy Grace, former prosecutor and now anchor at Court TV, thinks the criminal justice system, under the influence of high-profile defense attorneys, celebrity defendants and an uncritical media, is going to hell in a handbasket. So she has signed to write a book called Objection! for Hyperion, in the person of publisher Bob Miller. She will detail what's wrong and offer suggestions for improvement. Miller bought world rights, including book club, audio and serial, from Frank Weimann at the Literary Group and will publish next spring.