Why does Sutton come to see Atlas at Bib's?

Sutton comes to see Atlas at Bib's when he is on his date with Lily. Darin seats her at a table. When Atlas returns, he joins her and asks what she wants. She wonders if he knows where Josh is. Atlas has no idea who she is talking about, and he says so. She says that Josh is her little brother and he is 11. He ran away and she is going to go to jail if he does not get to school. She wants Atlas to find Josh.