Reading order
| # | Title | Published | Author | Buy on Amazon |
|---|---|---|---|---|
| 1 | Bondmate | 2014 | Lily Harlem | Buy |
| 2 | Traveler; Planet Athion | TBD | Lily Harlem | N/A |
| 3 | Broken | 2014 | Lily Harlem | Buy |
| 4 | Proposition | 2014 | Lily Harlem | Buy |
| 5 | Captive | 2014 | Lily Harlem | Buy |
| 6 | Forbidden | 2014 | Lily Harlem | Buy |
| 7 | Damaged | 2014 | Lily Harlem | Buy |
| 8 | Defiance | 2014 | Lily Harlem | Buy |
| 9 | Unexpected | 2014 | Lily Harlem | Buy |
| 10 | Assassin | 2014 | Lily Harlem | Buy |
| 11 | Ruled | 2015 | Lily Harlem | Buy |
| 12 | Redemption | 2015 | Lily Harlem | Buy |
| 13 | Reckless | 2017 | Lily Harlem | Buy |
The Planet Alpha series by Lily Harlem is a sci-fi romance collection set on an alien world. Beginning with Bondmate in 2014, the series explores what happens when human women end up on a distant planet ruled by powerful alien males who claim them as mates.
Each book follows a different pairing, with titles like Broken, Captive, Forbidden, and Defiance reflecting the tension between the human heroines and their alien counterparts. The series blends world-building with romance, creating a setting where cultural clashes and physical attraction drive each story. With 13 books published between 2014 and 2017, the series built a connected universe that grew more complex with each installment.