The Changeling (film)

John Russell (George C Scott) is still reeling from the deaths of his wife and daughter, when he leases an old mansion in Seattle. There, he experiences a lot of supernatural weirdness, prompting him to research the place, where he discovers a rather unsettling secret....

This movie contains examples of:

 * Cobweb Jungle: The hidden room in the attic.
 * Infant Immortality: Averted hard.
 * Nothing Is Scarier: One of the best examples of this.
 * Offing the Offspring
 * Ominous Music Box Tune: The musicbox found in the hidden room.
 * Spooky Seance: Provides clues to the reason of the haunting.
 * Unfinished Business