"In the winter of 1969, the bodies of four young women were discovered in a cemetery near the tip of Cape Cod. In a place once known as Helltown, the victims had been shot, stabbed, dismembered, and mutilated. As investigators would soon learn, the perpetrator was a young, handsome, serial killer named Tony Costa. A bizarre former taxidermist with a split personality and penchant for violence, Costa ultimately mobilized friends in the hippie community...