- Series: Lords of the Underworld Universe Series Record # 33408
- Series Tags: paranormal romance (24), angels (2)
- Lords of the Underworld Universe
- 1 Lords of the Underworld
- 1 The Darkest Night (2008) by Gena Showalter
- 2 The Darkest Kiss (2008) by Gena Showalter
- 3 The Darkest Pleasure (2008) by Gena Showalter
- 4 The Darkest Whisper (2009) by Gena Showalter
- 5 The Darkest Fire (2008) [SF] by Gena Showalter
- 6 The Darkest Prison (2009) [SF] by Gena Showalter
- 7 The Darkest Angel (2009) [SF] by Gena Showalter
- 8 The Darkest Passion (2010) by Gena Showalter
- 9 The Darkest Lie (2010) by Gena Showalter
- 10 The Darkest Secret (2011) by Gena Showalter
- 11 The Darkest Surrender (2011) by Gena Showalter
- 12 The Darkest Seduction (2012) by Gena Showalter
- 13 The Darkest Craving (2013) by Gena Showalter
- 14 The Darkest Touch (2014) by Gena Showalter
- 15 The Darkest Torment (2016) by Gena Showalter
- 16 The Darkest Promise (2017) by Gena Showalter
- 17 The Darkest Warrior (2018) by Gena Showalter
- 18 The Darkest King (2020) by Gena Showalter
- Dark Beginnings (2010) [C] by Gena Showalter
- Lords of the Underworld Insider's Guide (2016) [SF] by Gena Showalter
- Recruit or Kill? (2016) [SF] by Gena Showalter
- Lords of the Underworld Collection Volume 1 (2018) [O/1-4] by Gena Showalter
- The Darkest Facts (2018) [SF] by Gena Showalter
- Lords of the Underworld Collection Volume 2 (2018) [O/6-9+1ss] by Gena Showalter
- Lords of the Underworld Collection Volume 3 (2018) [O/10-12+1ss] by Gena Showalter
- Lords of the Underworld Collection Volume 4 (2018) [O/13-16] by Gena Showalter
- The Darkest Captive (2018) [SF] by Gena Showalter
- The Darkest Assassin (2019) [SF] by Gena Showalter
- The Darkest Destiny (2021) [SF] by Gena Showalter
- 2 Angels of the Dark
- 1 Wicked Nights (2012) by Gena Showalter
- 2 Beauty Awakened (2013) by Gena Showalter
- 3 Burning Dawn (2014) by Gena Showalter
- 1 Lords of the Underworld