As scandalous as any modern-day celebrity murder trial, the "Giroux affair" was a maelstrom of intrigue, encompassing daggers, poison, adultery, archenemies, servants, royalty, and legal proceedings that reached the pinnacle of seventeenth-century French society. In 1638 Philippe Giroux, a judge in the highest royal court of Burgundy, allegedly murdered his equally powerful cousin, Pierre Baillet, and Baillet's valet, Philibert Neugot. The murders...