Vampires are a little like burglars, okay? If a bright, determined vampire really wants to get into your house, he’s going to do it, and the best alarm system in the world and the electric moat and the sixteen genetically enhanced Rottweilers and the wards and the charms and the little household godlets blessed by the priests or pontifexes of the religion of your choice, and spellcast by the best sorcerers money can buy, aren’t going to stop him. Or her. You really don’t want to piss a vampire off, because it’s a lot harder having all that plastic surgery and the hemo treatment to change your blood chemistry than it is to sell your house and go live in a small cabin with nothing in it to steal.