Noah?

One of the characters, Noah was been absent from the story-line as of now. After he was talking t Jocelyn one night, he never really came back. Was it intentional by the author to do that? Or will not affect the story at all? Jack had disappeared much like this. Could there be a connection to both vanishings? We will just have to read to find out the rest of novel to find out how everything will play in together at the end!