goosebumps: Ghost beach

Jerry and her younger sister Terri visit their far cousins, I'll proabably say that they are aunts or something. They visit them like every summer. There's a beach and a huge graveyard with all sadlers. When they are expoloring the graveyard...they meet three children. They are Sadlers too just like Jerry and Terri. But they always seem to follow Jerry and Terri and doesn't want to talk about ghosts. But there are ghosts in this place but Jerry and Terri can't just know everything detailed. One day the three children tells them the whole story and after some weeks Jerry and Terri finds their tombs...their aunts say that those are just the prepared ones. But something terrific happens...! Want to find it out read this most awesome book from goosebumps and find it out guys!