A serial killer is loose, a professional photographer taking a “sentimental journey” around the country, murdering as he goes and recording the deaths for his private collection. With him is a college girl he has kidnapped to be his biographer, his “Boswell” and whom he has terrorized into submission. Pursuing him is a woman police detective whose own niece has been one of the victims, and the killer’s brother, a psychiatrist specializing in sex offenders, who must search his mind and memory to figure out where his brother might strike next, and when. In a nightmarish odyssey across America, the killer leads them on, sprinkling clues and bodies as he goes, until all finally comes together in a scene of devastating horror and suspense.