Fresh from her sleuthing in Death Comes As Epiphany (1993), 12th-century novice nun Catherine LeVendeur will leave the convent of Abbess HÇloãse and marry Edgar, student of the now frail Peter Abelard. The pair will take on dangers with derring-do to solve the curious murder of a young countess named Alys, whose death has something to do with property bequeathed to the convent and the tangled fortunes of a particularly nasty family. Among the puzzlements: Alys's sister, a silent nun presumed dead to the world, and her bitter secret; the death and dismemberment of a mild gossip; an assault on a convent nun; the tangled motives of the dead countess's horrid mother, who has lethal plans for snooping Catherine. Throughout, there are congenial chats with kin, the like-minded, and the high-minded. Catherine's father, a ``Jewish apostate,'' has ongoing problems, as does the beleaguered Abelard, headed for condemnation by the Council of Sens. With richly satisfying settings, this smooth mystery is tight as a tambour. Top-notch sleuthing, classy with Latin saws and observations.