uni. what RDV said.
Im started reading the series a couple of months ago...and still catching up. The purpose of that post is just to keep track of all the mysteries that have been posed.
Take the Varys/Illyrio plot. In GoTs, Arya is in the dungeons with the dragon skulls. She didnt see the two men talking, but the TV show gladly surrendered their identities. Further Varys and Baelish had a small parley prior to a small council meeting in the show, where Baelish reinforces the fact that Varys is conspiring with "a certain foreign diplomat."
As far as I know, Varys is still working with Illyrio, he gave him Tyrion. Varys must have an ace-in-the-hole. And here's why. When Robert attended a council meeting he wanted Dany dead; notice Varys did not object. This leads me to believe, he doesnt have all his eggs in one basket. But as Ser Barristan said when explaining to Dany, "too many Dragons are worse than too few." So if Varys knows of another Targaryen, ******* or pureblood, or even a "last Valaryan" he may have to decide which one wins the crown. (Hell Varys probably had no intent on seeing Viserys on the Iron Throne, too much of his father in him.)