If you've never been published before, you're an 'unknown quantity', so you're going to have difficulty selling your first novel.
('chiefly US') The 'big unknown' [=the important thing that everyone would like to know] is how investors will react.
A 'fear of the unknown' kept her from changing jobs.
(..) I'll speak to you later. Yep. If you look closely. I'm in there. These, these photos are incredible. I recognize so many famous faces. Keep going till you get to an unknown year old. What? No! Is that you? It's me, right next to D.W.Griffith. Oh, my Goodness! I grew up in this town but thank God, (..)2016 Café Society