This discussion may contain spoilers!
The Witching Well is mentioned in Episode 1 and seen in Episode 2. It's said that if you throw something into the well it is a bottomless pit and you never see the objects again. I had a theory that Faith's body was thrown into the well; what better place is there to hide a body? I found it weird though that Crane or whoever it was tired to hide Lily's body by throwing her in the river.