What number film in the James Bond series was the next to use the title of an Ian Fleming story after the fifteenth?
The Living Daylights: The Living Daylights (1987) is the fifteenth entry in the "James Bond" film series and the first to star Timothy Dalton as the fictional MI6 agent James Bond. The Living Daylights:  It was the last film to use the title of an Ian Fleming story until the 2006 instalment "Casino Royale". Casino Royale (2006 film): Casino Royale (2006) is the twenty-first spy film in the Eon Productions "James Bond" film series and the first to star Daniel Craig as the fictional MI6 agent James Bond.
twenty-first