""The Pleasure Merchant" is a hilarious, sensuous, and ultimately ferocious quasihistorical novel about that most crucial of periods: the dawn of the modern era. The merchant class flexed its muscles, scientists turned their attentions to the workings of the human mind, sexual mores were challenged in public and in secret, and in every corner of society the unseen hand of the marketplace dominated all. Tanzer's clever slicing of the era reveals every...