Picture Mommy Dead (1966)

See terror catch fire!

Susan Shelley is released from an asylum where she's been confined to after the shock suffered over the fiery death of her mother. Her father has a new wife, who has only married him for the money left to him by his dead wife. Susan is still haunted by her mother's memory, and her step-mother is conspiring with her lover to get the troubled girl to lead them to her mother's missing diamond necklace.