"American writer" . "Gareth Penn"@en . "1941Z"^^ . . . "Penn, Gareth"@en . . . . . . . "Gareth Sewell Penn"@en . "Gareth Sewell Penn (born 1941) is an American true crime author and amateur detective known for being among the first non-journalists to write about the Zodiac Killer case."@en . . .