Pure    by Andrew Miller  •  Paperback, 331 pages        In 1785, before there were Superfund sites, there was Les Innocents, a decomposing mass-grave cemetery poisoning Paris. Its toxins were so bad that the attached church had to be shut down, and the whole neighborhood smelled like death. Into this disaster steps the hero of Andrew Miller&#x27;s brilliant Pure, a humble engineer named Jean-Baptiste Baratte sent by Versailles to mop up. Along with exhuming generations of corpses, he must…