In short, the child you save at the very beginning and pretty much foster turns out to be the main villain, all grown up and from one point in time no less, future most probably.
As crazy as it may sound it actually makes perfect sense, there are lot of subtle clues pointing to this through out the game that you're bound to miss on your first playthrough. Alvin, the child you save, has potential to be one of the most powerful mages ever to be seen, according to Triss. She even gave him a medallion to subdue his power. You get to teach Alvin certain values, interact with him in an interesting manner. Alvin disappears in Chapter IV by opening a portal to save himself from Elves never to be seen again. In one of the last Chapters you get to met Grand Master of the Order, Jacques de Aldersberg, your main adversary as you soon find out, who incidentally saves you. Jacques is not a nice person, not only does his Order fight Elves religiously but he experiments on humans, trying to elevate them to a level of a Witcher, although he does have a somewhat valid reason for the second one but I won't go into details right now.
You eventually defeat Jacques after which on his body you find the exact same medallion Triss gave to Alvin, just older with signs of wear. That's when things start to click, start to make sense as to who Jacques is and why he does what he does. When you first met Jacques, after he saves you, he says he's merely returning the favor, but Geralt never met him, or so he feels, but you did however saved Alvin on more than one occasion. Another subtle, but brilliant clue is if you let Alvin have a dog to take care of you'll see Jacques in a company of a dog. Jacques's conversation changes depending on what you thought Alvin as a kid, especially in final battle, that's why Jacques sounds all too familiar sometimes but it's done so well that you can never ever pinpoint why. It also explains why Jacques hates Elves, funny enough Alvin would always chose to be the Grand Master while playing with other kids, even the Wild Hunt suggests that you once knew Jacques by a different name. I could go on listing dozen of tiny details that makes this twist ever so great but frankly my memory is bit foggy right now.
Bookmarks