Is it more than just a one-bite stand? Angie McCaffrey has endured her share of liquid lunches and boardroom shmoozefests to win new advertising clients. But her latest account–a cosmetics line for wannabe vampires–involves some unusual customer research at San Francisco's hippest private nightclub. The «undead» patrons are about as genuine as Macabre Factor's press-on fangs, but one thing is very real–the skin-tingling connection Angie feels with her clients' mysterious friend,...