Ive read 7th Retribution. The plot is exactly as written on the lexi page.
A seventh temple of assassins that turned out to be a rather horrible idea going wrong in the worst way possible.
Basically an assasin whom absorbs biomass and reshapes it to her will. I had quite a vibe of the Species movies when I read the stories.
I found the book a decent read, and its not super focused on Danath Lysander as one might have feared. But we see him rail against the machinations in the shadows and striving to bring an end to it.