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Many years ago, the young bandit El Diablo disappeared into a cave, never to be seen again. Now an eerie moaning sound is coming from his old hideout, and the ranchers who live nearby think he may still be alive.
The Three Investigators set out to explore the moaning cave--and soon wish they had come armed with more than a flashlight!
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The young detectives wanted to take their minds off the troubles at the Crooked-Y Ranch--the mysterious accidents, the strange moaning cave, and the fears that the legendary outlaw El Diablo might have returned. So the boys set off on a leisurely stroll into town.
Suddenly they heard thundering hoofbeats behind them. They whirled to see a sinister horseman galloping down the highway. The glowering rider was dressed entirely in black--and he was aiming his ancient pistol right at the boys!
The Three Investigators couldn't believe their eyes. It was the terrible El Diable--in person!
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