Black Monday

Wide-eyed Blair is thrust into the crazy world of 1980s Wall Street. Mo begins his master plan to take over the Georgina Jeans Company.

As Dawn and Mo fight over her desire to be made partner, a Hollywood screenwriter shadows Mo around the office; Keith plays a prank on Blair.

Mo tries to develop a bond with Blair and Keith finds it increasingly difficult to hide his secret, while Spencer and Dawn have a lively dinner with Dawn's parents.

Mo and Dawn try to persuade Blair and Tiff to get back together, in order to keep the Georgina play in production. Meanwhile, Mo is haunted by some old debts.

Mo goes with Dawn to the Predator's Ball to try to pay off their debts; Blair is given a weekend work assignment.

Mo's feelings for Dawn threaten to cloud his judgement at Blair and Tiff's engagement party. Wayne and Yassir find themselves in deep trouble.