In Chapter 74, while reading through old town records, the party learned about Clymes Prett, an occult bookseller from Rozenport who was put on trial in Thrushmoor twenty years before the start of the campaign, when Count Lowls III (who was still alive at the time, though suffering from a strange wasting sickness) leveled a laundry list of accusations against him. Lowls III accused Prett of engaging in a decades-long affair with his wife Nemira, saying Prett never released her from his “lusty clutches” after their time together at the Sincomakti School, and Lowls claimed Prett had poisoned him (and was thus the cause of the disease that was killing him).
Prett was sentenced to die in his cell below Fort Hailcourse. And shortly thereafter, Lowls III died from his illness.
First Reference: Chapter 39
Other Notable References: Chapter 63, Chapter 74