Nightwolf by Karina Halle
This book is a spinoff of The Dark Eyes Duet, featuring Wolf & Amethyst, but can be read as a total standalone.
Purchase Link:
Amazon: ➜https://amzn.to/3FIg9CD
Available in Kindle Unlimited.
Goodreads Link:
➜https://www.goodreads.com/book/show/57661722-nightwolf
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Incredibly emotional and intense story.