The Girl Who Knew Too Much by Tiffany Brooks 

High school senior Riley Ozment is desperate to change her reality after making a fool of herself on social media. She needs to do something drastic to repair her social standing—like trying out for a Survivor-style reality TV show. Suddenly, Riley’s dropped onto a deserted tropical island with nineteen other teens competing for a million dollars and a rumored treasure lost on the island. But that treasure has a history: a local curse says that seven people need to die before the treasure can be found. And six hunters have already lost their lives in the search. Who will be the seventh?