A girl visits her summer house on the beach with her family. The girl, her brothers Bernard and Gerard, and their neighbor Jason, play a game where they dare each other to go exploring in the abandoned sand dunes and try to find a treasure. They are scared of the sand dunes because Jason’s dad tells a story about how he found two dead boys who had killed themselves in the dunes. Jason’s dad also had a friend who killed himself on that same beach. Another neighbor, an old man the kids call Grandpa Sheet, tells the kid that he will give a reward to any of the kids who go the “furtherest” into the dunes. When the kids are teenagers, Grandpa Sheet finally follows through and tells them that he will give a pack of beers to the kid who goes the “furtherest.” The girl, her brothers, and Jason all go out and find a memorial in the dunes. Next to the memorial are wilting flowers and a jar with a weird yellow substance. They return to their house and get the beer from Grandpa Sheet. The next day he gives them jam in jars that are the exact same as the ones with the yellow substance. The girl doesn’t return for fifteen years, but finally does with her family. Bernard had just attempted suicide and they all decide to spend some time together at the beach house. Jason’s dad is also there at the house next door. The woman and her two brothers decide the next day to walk out into the dunes and they find three more memorials, similar to the first, all with jars of the yellow substance. They also find a pile of rocks with letters inscribed in them that spell out the word “furtherest.” They think Grandpa Sheet might have put the memorials and rocks there, but he had also died a few months before. They return to their parents and Jason’s dad and they all decide to clean out Grandpa Sheet’s house because it has been abandoned for so long. They clean it out as well as his boatshed. Jasons’ dad tells them a story that he was planning on killing himself a few months before, but shook himself out of it at the thought of food. The next morning he had found Grandpa Sheet hanging in the boatshed.  As they are cleaning out the boat shed they find six mannequins all dressed in different clothes. Jason’s dad says that the mannequins were used by the police to identify possible suspects after the boys died on the beach. The woman points out that one of the mannequins is dressed like Grandpa Sheet used to dress and that all of the plastic figures are leaking the yellow substance that they had found in the jars. The woman decides to collect the liquid from the one that is dressed like Grandpa Sheet. They set the mannequins up in front of one of the houses and the woman helps Bernard move into Grandpa Sheet’s old house. One night the woman sees her father get hit by someone in the dark, but her father denies that anyone was there. The next day Bernard invites everyone over for drinks and he seems relatively happy. The woman is the last one to leave and as she does, she thinks she sees Bernard waving to someone. The day after, Bernard leaves a suicide note and they find him in the dunes with his wrists slit. After that the woman’s parents want to sell the beach house, but the woman convinces her parents to keep it. She begins to spend a lot of time there, talking with Jason’s dad and hearing voices telling her to kill herself. She holds strong and decides that it is Jason’s dad’s turn to die, as he has evaded suicide too many times.