However , upon finding the diary , Pete shows up , holding Donald 's nephews hostage in exchange for the diary . After giving Pete the diary , Donald travels to Pete 's hideout to defeat Pete and get the diary back . The diary reveals that the map , when dipped in water , will reveal the location of the Great Duck Treasure . Donald flies to the island where the treasure is hidden and manages to evade its traps in order to reach the treasure vault . After defeating the ancient spirit guarding the treasure , Donald opens the vault only to find a simple stone statue . When the disappointed Donald returns home , Huey , Dewey and Louie accidentally break the statue , which reveals a golden jeweled necklace was hidden inside . Donald gives the necklace to Daisy and the two fly off into the sunset together .