I Am Number Four: The Lost Files Books in Order

When the Lorien Legacies first hit shelves, the focus was tightly locked on John Smith and his desperate attempt to blend into a small Ohio town. But the premise of the series—that nine alien children were scattered across the globe—begged for a wider view. That is exactly what The Lost Files provides. Originally released as a steady stream of digital-only novellas, these stories were written to bridge the agonizing gaps between the massive hardcover releases of the main novels.

For a long time, these short stories were treated as bonus content for the die-hard fans who couldn't wait a full year for the next installment. Eventually, the publishers recognized that these weren't just throwaway scenes; they were vital pieces of the puzzle. The ebooks were bundled together and released as paperback collections, such as The Legacies, Secret Histories, and Hidden Enemy, allowing the full scope of the invasion to sit on the shelf alongside the main saga.

The biggest draw here is the shift in perspective.

In the primary books, you are often limited to what John knows. In The Lost Files, the authors take you across the world to witness the lives of the other Numbers before they managed to find one another. You get to see the grit and loneliness of Number Six as she developed into a warrior without a team to back her up. You experience the isolated luxury of Number Nine’s life in Chicago, or the spiritual, tragic upbringing of Number Eight in India. It turns mythical figures into flesh-and-blood characters with their own distinct voices.

It isn't just about the superpowered teenagers, either. The scope widens to include the humans and guardians caught in the crossfire. There are stories dedicated to the Cépans—the adult mentors sworn to protect the children with their lives—giving weight to the sacrifices that are often only mentioned in passing during the main timeline.

Perhaps most surprisingly, the series dares to step inside the enemy camp. Rather than painting every Mogadorian as a faceless monster in a trench coat, these files introduce perspectives from within the invading army. It adds a layer of complexity to the villains, showing that not every soldier blindly follows the Great Book.

Because these are novellas, the pacing is significantly different from the main novels. There is very little room for high school angst or slow-burn romance. The narrative is stripped down to the essentials: survival, evasion, and combat. It feels less like a superhero drama and more like a fugitive thriller, moving rapidly from one close call to the next.

While you can technically follow the main plot without reading these side stories, you would be missing the connective tissue of the universe. These files explain how characters got from point A to point B and reveal the secret history that drives the war. They transform the background noise of the invasion into a clear, devastating signal.