The Sniper is a 1974 thriller novel by American author Nelson DeMille.
The Sniper introduces character NYPD Sergeant, Joe Ryker.
Like the other books in the Joe Ryker series, it was re-published in 1989 with the author as "Jack Cannon."
(In the later reprints of the book, the antagonist's name is changed to Henry Cyrus.)
The sniper chooses his victims at random, killing with the cold skill of a professional.