Unwilling to give up, Corrie thinks over the case at home, and comes up with an interesting clue: one of the killer's victims was, unusually, boiled whole. There are few places with either the equipment or the privacy needed to do such a thing, but one is a local tourist attraction, Kraus's Kaverns. The elderly owner of a small bed-and-breakfast near the cavern entrance, Winifred Kraus, is the daughter of a Prohibition-era bootlegger who kept a secret still in the cave.