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Publication Order of Standalone Novels
| The Letter | (2013) | Hardcover  Paperback  Kindle |
| The Secret | (2016) | Hardcover  Paperback  Kindle |
| The Key | (2018) | Hardcover  Paperback  Kindle |
| Her Last Promise | (2019) | Hardcover  Paperback  Kindle |
| The Memory Box | (2021) | Hardcover  Paperback  Kindle |