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Publication Order of Callahans/Sins Books
| Midnight Sins | (2011) | Hardcover  Paperback  Kindle |
| Deadly Sins | (2012) | Hardcover  Paperback  Kindle |
| Secret Sins | (2012) | Hardcover  Paperback  Kindle |
| Ultimate Sins | (2014) | Hardcover  Paperback  Kindle |