The Three Investigators and the Singing Serpent

Admittedly, Mrs. Patricia Osborn is a somewhat strange lady. She gets on her niece Allie's nerves by claiming that cobwebs are excellent medicinal herbs, that she draws a circle around her bed with a knife before going to sleep to protect herself from impending doom, and that she invites people to mysterious gatherings at night. Allie therefore asks the Three Investigators to get to the bottom of this mystery. Our detectives sneak into Mrs. Osborn's house and observe gruesome things. What could they have seen?

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