Brass Carriages and Glass Hearts (Steampunk Proper Romance #4) by Nancy Campbell Allen

Emmeline O’Shea is determined to save the world—single-handedly, if necessary. A strong voice for societal reform, she is the natural choice to deliver a key speech at the end of the International Shifter Rights Organization’s week-long Summit in Scotland.

But when a death threat arrives at Emme’s home, she is immediately placed into protective custody, watched over by none other than her personal nemesis, Detective-Inspector Oliver Reed. The two have crossed paths many times, with disastrous results, but now they will have to work together in order to reach the Summit before midnight of the last day in order to ensure legislation is passed to protect the Shifter community.

As unseen enemies close in around Emme and Oliver, they struggle to reach Edinburgh by any means necessary, only to find Emme’s vindictive stepsister, Oliver’s vampire brother, and a dangerous political minefield awaiting them in Scotland.

Even more difficult is their own refusal to admit that the fiery animosity that once burned between them might be turning into the heat of romantic passion. Could a straitlaced policeman determined to uphold the law and an outspoken activist willing to break the rules ever find true love? Or will all their dreams shatter like glass when the clock strikes midnight?

This book is the 4th book in the series and is loosely based on the fairy-tale of Cinderella.   I find this book intriguing that they are set in the steampunk era and also include shape shifters and vampires, robots and more.   The characters in the books are thought out and the females are empowering.  It is fairly fast paced and goes hand in hand with the other books in the series.