The House by the Cemetery (1981) Full Movie [Internet Archive]
Read the fine print. You may have just mortgaged your life.
After a doctor kills his mistress and himself while researching the mysterious previous owner of his Boston home, his colleague, Dr. Norman Boyle, takes over his research and moves his family from New York City to the Boston mansion. Soon after, Boyle's young son Bob becomes plagued by visions of a young girl, who warns him of the danger within the house.