Reviewed by Linda C. Brinson DETECTIVE AUNTY. By Uzma Jalaluddin. Harper Perennial. 324 pages. $17.99, trade paperback original. Uzma Jalaluddin’s debut murder mystery is both familiar and different, a well plotted and well written whodunit that should appeal both to mystery fans and to readers who have enjoyed Jalaluddin’s earlier novels, which are generally considered…