When Graveyard Gruber discovers a locket buried along Cate's Creek, his scalp tingles...a sure sign of ghostly involvement! At the history museum, Graveyard learns of the creek's history: a diphtheria outbreak, an abandoned settlement, and a tragic drowning. As the mystery of the Cate's Creek ghost gets muddier, Graveyard Gruber wants to keep investigating. But is this one mystery that's too dangerous to solve?