In 1976 Buenos Aires, Kaddish Poznan, the outcast son of a whore, who makes his living defacing Jewish gravestones, and his wife, Lillian, are devastated by the disappearance of their own son, Pato, which forces them into the bleak corridors of the Ministry of Special Cases in search of the truth, in a debut novel set against the backdrop of Argentina's Dirty War.  (ARG94, $25.00)