Despite frequent appearances by Susan Silverman (longtime love of Boston PI Spenser) and the absence of Hawk (his enigmatic sidekick), the latest entry in Parker's estimable series is a worthy one. Missing is the sap that can stickie-up scenes between Spenser and Susan, and in Hawk's place strides a new sidekick, Tedy Sapp, who's gay and as tough as they come. Tedy's only a temp replacement, though, because the reason he's here and Hawk's not is that most of the action takes place in rural Georgia, where Tedy owns a gay bar. Spenser travels there on his own temp job--to find out who's been shooting horses at Three Fillies Stables, owned by Walter Clive, the most powerful man in the county, and to keep that someone from shooting Clive's prize thoroughbred, Hugger Mugger. Spenser roots through the highly dysfunctional family of Clive's three daughters and their husbands (one a pedophile, one a drunk), annoys Clive's security men and befriends both Tedy and the local sheriff, with whom the PI discusses doughnuts. When Clive is shot dead, Spenser is fired by the alpha daughter, only to be rehired by Clive's mistress, who believes there's more to the mayhem than horseplay. This novel offers more traditional mystery elements than many Spenser tales, although most readers will finger the prime villain way before Spenser does. The pacing is strong, the characters are fresh as dew and the prose is Parker-perfect. The Spenser-specific personal drama that drives the best of the tales is lacking, but overall, the story will fit Parker fans like an old shoe. (Apr.) FYI: Parker's most recent novel, Family Honor, will be filmed starring Helen Hunt.