Let me see -- when I was discussing the story with Kyra last month, she helped me to realise that the library is protected -- I've been running with the vampires-can't-cross-threshold-unless-invited myth and working out how the magics would work mechanically, so to speak, and you can't make them, they have to be -- a psychic barrier of lived-inness protects a house from undead intruders; a house that's just been moved into would be less protected, the older a house is the more difficult it is for vampires to get in, temporary lodgings might be susceptible; it is entirely possible that vampires could get into Mr Caruthers' rooms without much trouble as he is hardly ever there and has no attachment to the place, nor has he really lived there. Anyway, the library is loved and lived-in by so many people -- especially Evangeline and Mr Caruthers -- that it does have that threshold protection, but it becomes significantly weaker when Mr Caruthers is absent. I'm not quite certain why he is so strongly tied to the building; perhaps it has something to do with the reservoir-of-magic/ley lines/something important that is built into/under/around/something the library, and probably Mr Caruthers having mucked about with unpleasant and too-powerful magics in his youth. Because the library is so tied to Mr Caruthers, at this point Evangeline's strong attachment to it does not affect the barrier much. He goes off on some Mysterious Plot-Important Errand at the beginning of the story, vampires break in, plot happens, people die, yay.
And then! While lying in the sun I realised that the vampires were looking for Evangeline when they broke into the library: and they got Lottie instead, because of some sort of misinformation, I don't know. I don't want to make this obvious on the outset, either. (They may have been interested in Mr Caruthers as well, I don't know, but understood they couldn't breach the library if he was there -- and Evangeline has something that they Need.) I think what they want Evy for is her story-sensing -- there's some kind of unrest, quite possibly related to the slow-building unrest which will only need the murder of Archduke Franz Ferdinand in less than two years to ignite the tinder for war, which may or may not involve governments trying to figure out how they can use vampires for things. (Rubbish, this is getting too complicated! I want a smaller story! Stoppit!) I am beginning to think that there is no useful future-seeing amongst the vampires because their unlife puts them out of time in a way -- so while some of them may get glimpses of the future it's not necessarily distinguishable from past or present or hallucination and is usually very random and unlikely to be at all connected to anything that the vampire could find useful -- since they absorb memories from the people they drink, they may be getting a glimpse of one of those lives, or perhaps the future of someone known by those people, and memories may tangle together as there is so much mixed blood. (There's a running idea of memory existing in the blood, and I must commend
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But then Mr Caruthers is also very very important and in some way key, and I'm beginning to understand that part of the end everything is leading to is the vampires wanting him or Mr Caruthers offering himself up as a tithe for some ritual/ceremony/use of magics -- a la Tam Lin. It is entirely possible that he would offer himself up out of sheer guilt -- he has this dangerous more-than-a-residue of the black magics that he toyed with irresponsibly as a youth and they could very well explode and do terrible things and he can't really control it, but willingly sacrficing himself in a situation in which a great explosion of magic would actually be a solution, well... And self-sacrifice would also cleanse the magics of their destructiveness. However, I have no plans nor desire to kill him, so that end will have to be worked through somehow.
There's also something about the trees of London coming to the aid of the city, in a way --
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Oh dear.