What was L'affaire des poisons all about.
Well if I remember correctly it’s a good old witch plot in the court of king Louis XIV. Some adventurer type died at some point, and when his debt collectors came to get what they could from his estate they found a box filled with incriminating shit, which, as it was investigated, revealed an increasingly larger and larger network of assassinations in the ranks of the French nobility.
Apparently some weird old lady known as la Voisin had been dablling in all kinds of occult shit, and had offered her services as a poison-person to nearly half the court, with an estimated death toll ranging from a thousand to a twice that.
After the whole business was unraveled by a special tribunal and most perpetrators died either executed or under torture, the king decided to have the records for the whole business burned, as it was all really unseemly.