The Horror At Park Slope
"De Vermis Mysteriis"
“The Mysteries of the Worm” published in 1542. Written in Latin. Apparently the work of Ludwig Prinn, an “alchemist, necromancer, [and] reputed mage” who “boasted of having attained a miraculous age” before being burned at the stake in Brussels during the height of the witch trials.
A cracked copy of this tome was found by Horace Mars in Ticocha’s tent.