Kate Daniels lives in a post-apocalyptic Atlanta Georgia. Magic has returned to the world. It shows up in unexpected Shifts that reek havoc with the remnants of modern technology. Any and every type of fairy tale or mythological creature exists in Kate Daniel's world. Kate isn't worried about them, though. Her only fear is the day that her father discovers her existence.
The Edge is the borderland between our world and a magical land known as "the Weird". Edgers are just trying to survive in an anarchistic society where the strength of your magic can change everything. Life is hard, poverty is rampant and, sometimes, happily-every-afters do occur.
Lots of action in both series. Excellent world-building. I wouldn't classify either of these series as "romances", but the Edge probably does emphasize the romance part a bit more.
Ilona is also doing a fun weekly serial on her website called the Innkeeper Chronicles. The main character operates an Inn as a safe house for extraterrestrial creatures. Lots of funnies in this one. Check it out and let me know what you think!
Kaylin escaped the poverty and abuse of her childhood to become a Hawk, a police officer of her world. She hasn't escaped everything, though. The mysterious magical markings covering her body, for instance.
The world building is again phenomenal. The books are good, but the series moves somewhat slowly. I don't have a problem with that, though. You learn as Kaylin learns and starts to come to terms with her past. Modern television not-with-standing, no one resolves trauma and solves deep mysteries overnight. I felt like it is probably more realistic to have main mysteries of Kaylin's life be resolved slowly. Along the way, you are entertained as Kaylin attempts to solve the police cases presented to her, often times having to save-the-world as she does so.
This is another series that will make more sense if read in order. Enjoy!