Samantha Eagleton and Winston Forbes are thirteen-year-old friends who live on Cape Cod in the the quiet resort town of Blue Fish Bay. Sam's father, who is chief of police, is away at a law enforcement convention, so she is staying with Winston and his mother. What should be the start of a relaxing vacation, however, turns into something more as Sam begins to see strange lights out on the Bay at night from her bedroom window. Lights that are right off the spit of land called Blue Fish Point
At first Sam is reluctant to make much out of this, but when the elderly woman she works for tells the story of a young girl who drowned on the Point over a hundred years ago and who's ghost some people claim to have seen, Sam's curiosity is raised. Dragging along a reluctant Winston, she begins to investigate, not stopping even when the threats begin. Is it a ghost or someone who is very human and up to no good? That's the question behind The Mystery of Blue Fish Point.