in the beginning of chapter 4 what happens

At a Sunday morning party at Gatsby's, Nick hears further gossip about Gatsby from a group of foolish young women. They say that he is a bootlegger who killed a man who discovered that he was nephew to von Hindenburg and second cousin to the devil. One morning, Gatsby invites Nick to lunch in the city. He proudly displays his Rolls-Royce, then abruptly asks Nick what he thinks of him. Nick is understandably evasive.