The book starts with a woman who kills 'bad' vampires while her tech of a brother stays in the car. When her brother quits to get married, she ends up working alone. I remember she is hurt and the lead 'good' vampire heals her on a plane. She ends up going to a paranormal party where she sees the ambassador or something killed by the vampire who killed her mom, but who is supposedly dead. She, the 'good' vampire, and a shape-shifting detective hunt him down after he kills one of their friends, and the bad guy is a semi-immortal who was her date and is using his own sister's blood to stay alive. She gets tortured by the 'bad' vampire and almost dies, but the one who likes her ultimately turns her.
Sorry, I'm really bad with names.
I was also wondering if it is stand alone or part of a series