The laugh filled the dark night--high and crazy like a hyena! Then a shadowy figure loomed in the blackness--tall, twisted, and humpbacked. Its small head jerked strangely. Who--or what--was this awful laughing shadow? The Three Investigators had to find out--before the shadow found them!
Preceded by The Mystery of the Talking Skull, and followed by The Secret of the Crooked Cat.
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