ASOIAF / Game of Thrones (SPOILERS INSIDE)

[Iandyan]

Isn't there a 4th sand snake that's been MIA this whole time?

I think there's one sentence in one of the books where Doran is like "Oh don't worry about ________. She has been in King's landing for awhile."

For some reason that's got my tinfoil hat all aquiver.