Ghost Beach (Classic Goosebumps #15)

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Jerry can't wait to explore the dark, spooky old cave he found down by the beach. Then the other kids tell him a story. A story about a ghost who is three hundred years old. A ghost who comes out when the moon is full. A ghost . . . who lives deep inside the cave! Jerry knows it's just another silly made-up ghost story . . . isn't it?!