Carnival Day, Tuesday: Port of Spain, Trinidad. Into this heady bacchanalian atmosphere, filled with men and women seeking the sinful anonymity of costumes, in street processions gyrating to the music of steel bands and in bars packed beyond capacity, where menace seems familiar but lurks in unknown places--comes the Obeah Man, Zampi, in search of the beautiful Zolda. By the time the festivities are over, disaster has struck, and the powerful...