The wizard was rich, eccentric--and dead. His house awaited adventurers' brave enough to try to seize what treasure he had left behind. The fresh bodies decorating the facade were only a mild deterrant.
The Hissmen sort of resembled gatormen, but they were much smarter and more dangerous. The attacks ended as mysteriously as they started. What they did with the humans they took back to their subterranean world, no one every discovered.
No one would have guessed the unassuming old lady was a witch. That’s before her dollhouses with their ritual dioramas--each room replicating (and causing) a recent murder--were found.
City officials were never happy with the public danger the monster trade represented, but of course, mail order businesses presented a question of jurisdiction.