Book Description: Skinny Joe Alister loves collecting rocks. He's a total fanatic about precious gems and rare stones. From kicking around fields, to scouring construction sites, Joe is always on the lookout for something special to add to his collection. Joe and his little brother Gary often prowl the underground walkways of Fairfield Caverns hunting for rocks, staying only in the areas open to the public. Today, Joe ignores his brother's warning and explores a dangerous, little-known section of Fairfield Caverns, a half-completed expansion site, far from the main path. Joe's heart pounds and his eyes widen as he unearths the horrible fate of the missing owner, and makes the most shocking discovery of all. Joe was looking for something special. He finds something rotten.