Richard Jury, the brooding Scotland Yard detective-hero of many of Martha Grimes's mysteries, is back in The Case Has Altered, but--as usual--his sidekick Melrose Plant steals the show. Set in the fens of Lincolnshire, Jury must investigate two murders in which his true love, Jenny Kennington, is a suspect. But while Jury deals with the evidence, Melrose uncovers the local color, interviewing everyone from uncommunicative pub owners to chatty cooks. Even murder seems a little less grim with Melrose Plant around.