""There's evil people around, Dermot love. . . . I knew about them even before me dream. Really evil people. Won't we have to fight them "" This latest tale of Nuala Anne McGrail, the engagingly fey heroine of such irresistible books as "Irish Cream" and "Irish Lace, " begins with a foreboding dream of some terrible impending evil. Dermot Michael Coyne, Nuala's adoring husband and spear-carrier, knows better than to ignore his wife's second sight,...