The story of Cassandra Chamberlain, a brilliant scientist who becomes one of Earth’s last survivors after an alien attack.
As of May 2026, M.K. Eidem’s officially contains four books , with the latest installment, Stephanie’s Challenge , released in 2019. While many fans are eagerly searching for a fifth book, there is currently no official title or release date for an "Imperial 5". The Imperial Series Overview m.k. eidem serie imperial 5
Focuses on Jacinda, a healer and widowed mother who catches the eye of King Jotham of the House of Protection. The story of Cassandra Chamberlain, a brilliant scientist
The Imperial series (also referred to as the Challenge series) is a cornerstone of Eidem’s science-fiction romance universe. It follows the survivors of Earth and their integration into the Carinian and Tornian empires. While many fans are eagerly searching for a
Follows Cassandra’s niece, Victoria, as she grows up among the Carinians and finds her life mate in a high-ranking pilot.
Additionally, an unrelated series by author titled " The Imperial Series " has five books, which may lead to mixed search results for this keyword. Status of Upcoming Releases
The confusion often stems from how readers track Eidem’s interconnected series. Her does have a fifth book titled Oryon . Because the characters from the Imperial and Tornian series frequently cross over, readers often look for the next chronological step in the shared universe.