This was a good tie-in to "Eclipse".
Clearly you can tell from the title, the story is writing about
Bree's life. It is writing in her point of view, about her time as
a vampire.
You learn that even being a vampire, it isn't necessarily good to
live among other new born vampires. Some are too temperamental and
egotistical. They have no problem hurting their own kind.
You'll read about why Riley really wanted to make a coven of
vampires. What lies he told to get these new born vampires to look
up to him as their leader, and being willing to fight in a vampire
war for him.
The Volturi are even in it. I think you kinda see a whole other
little evil side to the Volturi, probably more specifically
Jane.
I quite liked it. It was interesting, and it made me see things I
didn't think about in Eclipse. Actually, I think I like reading
about Bree more than I do Bella.