A Clash of Kings
Rickon Stark is Ned Stark's youngest child and is three years old in "A Game of Thrones". When Theon Greyjoy captures Winterfell in "A Clash of Kings", Rickon hides in the crypts. After Winterfell is sacked, he and the wildling woman Osha travel through the North. In "A Dance with Dragons", he is said to be on an island of cannibals, presumably Skagos.