The Detective is a thriller/detective novel by American author Roderick Thorp, first published hardcover in 1966. It was made into the 1968 movie of the same name, starring Frank Sinatra, as Detective Joe Leland. Billed as "an adult look at police life", The Detective went on to become one of the highest-grossing films of 1968 and one of the strongest box-office hits of Sinatra's acting career.