I found When Flowers Wilt thoroughly enjoyable. It was well crafted and the witchy world Masters envisioned was interesting. I loved the Dark Lady, she started off as a bit one dimensional, but her character got so much deeper and more complex as the story went on. Vivian didn't get quite as much depth, but I was captivated by her nonetheless. 

There were definitely some darker themes throughout the story, what with the Dark Lady being the ruler of Hell and all, but it was handled well. The relationship between the two developed at a nice pace, and there was some fun spice in the mix. It does end on a cliffhanger, but damn if I'm not looking forward to the conclusion!

I received a free ARC from the author, but my review is unbiased and left voluntarily.