When the ghost dog howls (goosebumps horrorland #13)

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In HorrorLand's eerie gift shop Andy finds a hound's-tooth necklace. The big tooth is yellow, has two sharp points, and, according to the shopkeeper, is said to grant wishes. But Jonathan Chiller knows something else about the tooth. It's said to be haunted by the ghost of a huge hound. A ghost that's got a mouthful of sharp teeth--but wants this one back.