Is any mystery writer more generous than Grimes in spinning out subplots and a supporting cast? In bringing Scotland Yard's superintendent Richard Jury to America to investigate the murder of young Philip Calvert, who worked in Philadelphia's Barnes Foundation, she provides not only two other murders (Baltimore street person John- Joy and ambitious Johns Hopkins Ph.D. candidate Beverly Brown) that might be connected--and just how they're connected is the best surprise here--but also a newly discovered story that Brown insisted was by Edgar Allan Poe (yes, we get to read the whole thing); a minimalist novelist, Brown's teacher, who chains herself to her writing desk; Jury sidekick Melrose Plant's swooping excursion into early Baltimore genealogy (courtesy of a riotously misinformed cabbie); and much, much more. As in Jury's recent cases (The Old Contemptibles, 1990, etc.), the high-spirited feast of episodes, settings, and allusions--from Chatterton to Barry Levinson to a secondhand store called Nouveau Pauvre--is too sumptuous for Jury or his fans to digest fully. But if some readers will complain that Grimes has left a million loose ends, nobody will rise from this table still hungry.