Search the indicated locations to find all 50 letter scraps in GTA V. Collect all of them to get the "A Mystery, Solved" achievement. They are also required to get 100% game completion. The letter scraps can be collected at any time, even at the beginning of the story. Unlike some of the other GTA V collectibles, there are no special requirements or side missions necessary to make them appear. You can also collect them with different characters. The letter scraps are small, glowing pieces of paper. Some of them can only be reached by using a helicopter. You can easily get a helicopter from the South Los Santos hospital helipad, or the Sandy Shores helipad. After collecting all 50 letter scraps, you must go to the green "Killer" question mark while playing as Franklin to meet Leonora Johnson's killer (Dreyfuss). You must kill him to get the "A Mystery, Solved" achievement.