Book of the Raven - implied child abuse/murder results in portal to the Shadowfell
Deep and Creeping Darkness - evil tortures and murders everyone in the village, and the adventurers are hired by the few broken survivors in the vague hopes of being able to return
Shemshime - a spirit drives everyone mad, causing them to murder everyone around them, and spreads virus like to anyone who hears the song
Price of Beauty - Hags strike Faustian bargains with people, only to betray them and keep them alive to torture them to death.
Book of Cylinders - in one scene, Yuan-ti devour children in front of their parents and laugh about it.
Sarah of Yellowcrest Manor - an entire family plus servants are murdered to power a ritual to bring back some evil from beyond.
I mean, sure, there's no orgy there, but, that's all pretty damn dark. To the point where one of my players complained that the module would be better set in Ravenloft than Candlekeep.