Fresh from the world of organized parties that we saw in Chapter 3, now we dive head-first into the world of organized crime. In The Great Gatsby Chapter 4, our narrator Nick gets a short private audience with one of New York's premier gangsters - Meyer Wolfshiem, Gatsby's business partner. But, just as Chapter 4 exposes the seamy side of get-rich-quick East Coast life, we also learn the origin story of Gatsby's love for Daisy.
So, basically: come to The Great Gatsby Chapter 4 for human teeth as jewelry, stay for the thwarted romance.