The Little Girl Who Lives Down the Lane(1976)

Ask her no questions, she'll tell you no lies. Ask her too many and somebody dies.

13-year-old Rynn Jacobs lives in a New England beach town. Whenever the landlady inquires after Rynn's father, she claims that he's not available. But when the landlady's son, Frank, won't leave Rynn alone, she teams up with a neighbor Mario to maintain the dark family secret that she's been keeping to herself.