This is book three. It can be read without reading the first.
Spellbound, takes the point of view of two of Amber's teammates of assassins searching for the missing werewolf females sold to sorcerers.
This takes the point of view of Amber, a spy/assassin sent in to find missing werewolf females sold to Vampires.
Here's the Awakening Series:
The Awakening: The Beginning
The Awakening: Bloodlust
The Awakening: Spellbound