Case of the Late Pig, the (Classic Crime)

"Pig" Peters made Albert Campion's life a misery at prep school, and now that he's dead, Campion is hard-pressed to squeeze out a tear. Still, he does attend the funeral. Not because he regrets the passing of the Pig, but because he got an intriguingly anonymous invitation and Campion never can resist a mystery. The mystery deepens significantly six months later, when a friend in the countryside urgently requests Campion's help. On arrival in Sussex, Campion is presented with a dead body that, in life, most definitely belonged to the late-and-not-much-lamented Pig. So who, exactly, was buried six months earlier? As mourners for the previous funeral turn up-- as well as some of Pig's newer though not-particularly-grieving acquaintances-- Campion is even more confused, but he eventually gropes his way to a solution.