One

Opioid: (noun) a compound resembling opium in addictive properties or physiological effects.

Ryan is part of the Motionless clan; a group of vampires who reside in Philly. He spends his time drinking blood, killing people, and playing the keyboard. The same thing, day in and day out. But when his friends push him to go to a night club to find some victims or some lovers, he meets a girl whom he can't find it in him to kill.
Ryan Ashley Malarkey.
And he becomes addicted to her.