Ant and Dec embark on their journey to New York. Here, they are following their mother lines using DNA analysis and genealogy. Straightaway, there's a surprise for Dec as he finds out he has close DNA family he never knew existed, while Ant's history takes him to the United Nations. After a whirlwind tour of the US, it's back to Ireland and uncovering a family secret that Ant's family have been trying to unlock for years.