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How to Seal Your Own Fate by Kristen Perrin
Annie Adams has been living at Gravesdown Estate for several months. She inherited the mansion and land when she solved the murder of her great aunt Frances. That mystery is covered in the first book of the series and I think you almost need to have read How to Solve Your Own Murder in order to understand the history and relationships in this one. It's a small town full of secrets and gossip, and just because you've known someone your whole life doesn't mean you can trust them.
Annie is already feeling unsettled - the house is big and cold, the townspeople are not overly friendly, when she meets Peony Lane, the fortune-teller whose prediction guided most of Frances' life. Peony has a fortune for Annie, but she won't tell it unless asked. She also gives Annie some advice about looking into a decades old accident. Not much later, Peony is found dead, murdered in Annie's solarium. Annie, of course, gets wrapped...