This book is not making any sense to me. So the hero has been watching her for a long time because she's his mate but he waits until she's in danger to get close to her? And the romance is so unromantic. "You've been my woman for centuries. You'll remember me." Yeah, right.
And how do the villains find these people so quickly! I really don't know how an old woman could see somebody in a dark balcony in a house with tall walls set off the street? Does she have binoculars with infrared vision?
When I start wondering about these details, it's time to let a book go.