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Publication Order of Standalone Novels
| A Woman of War / The German Midwife | (2018) | Hardcover  Paperback  Kindle |
| The Secret Messenger | (2019) | Hardcover  Paperback  Kindle |
| The Berlin Girl | (2020) | Hardcover  Paperback  Kindle |
| The Girl Behind the Wall | (2021) | Hardcover  Paperback  Kindle |
| The Resistance Girl | (2022) | Hardcover  Paperback  Kindle |