When an ad appears in the gazette announcing a murder to take place on Friday at Little Paddocks at 6:30 p.m., the locals show up, assuming it''s a murder mystery party, only to get shot at and then become witnesses to the real murder of a boy no one knows. Fortunately, before too many of them get bumped off, Miss Marple arrives and unravels this tangled skein. Most satisfying all the way around.