The body is that of Anna Jessup, and it is soon established that the two are twins, each adopted by a different family at birth. The question is who, exactly, is Jessup, and which of them was the intended victim? A detective, Rick Ballard, comes forward convinced that Jessup was killed by her lover, a pharmaceutical baron, who abused her and jealously stalked her after she left him. Ballard had assisted Jessup with her "disappearance" into a town in Maine after anonymous threats suggested there might be a deadly ending. Ballard's intense involvement makes Isles wary, but at the same time she senses a personal chemistry.