Tones echoing in the darkness

Exploration Stage: Scientist's Mansion
From: Albert Wise
Description: Someone was breaking into Charles' house and scouting him out...hard to believe, but I'm glad I noticed. I found this black bell in Charles' study. Take a good look.
Completed: This black bell was made by the Shadow Disciples and has the effect of putting a person into a deep sleep. Perhaps the cult members put Charles to sleep and searched his house while he slept. I hope this is just speculation!