In a 'Blackmailing Mrs. Fine' fantasy story, you need to focus on the emotions of the characters. Mrs. Fine could be initially terrified by the blackmail, but then her anger and determination take over. The blackmailer should also have complex motives. Maybe he was wronged in the past by someone related to Mrs. Fine and is seeking revenge in a wrong way. You can use descriptive language to paint the world they live in. For instance, if it's a medieval - like fantasy world, describe the cobblestone streets, the thatched - roof houses, and the magical auras that surround the characters. This will draw the reader into the story and make them care about what happens to Mrs. Fine.
Well, writing such a story requires a vivid imagination. For the setting of the 'Blackmailing Mrs. Fine' fantasy story, it could be in a magical land full of strange creatures. The blackmailer might be a desperate wizard who needs Mrs. Fine's knowledge to complete a dark spell. Mrs. Fine, on the other hand, could be a kind-hearted but strong - willed woman. You can build tension in the story by having the blackmailer make increasingly dangerous threats, and as the story progresses, Mrs. Fine discovers some hidden strength within herself to face this ordeal.