Watch Black Monday

Everything comes crashing down.

Mo is determined to make Blair and Tiff's marriage happen, for better or worse. Keith tries to impede the SEC's sting operation by any means possible.

We get a glimpse into Mo's past, while Blair and Dawn pursue some necessary detective work.

Mo takes Blair on his bachelor party, while Dawn realizes she's a very important guest at Tiff's bachelorette party. Keith faces a loaded decision.

At Blair and Tiff's engagement party, Mo's feelings for Dawn begin to cloud his judgment. Wayne and Yassir get into serious trouble, while Keith takes a big step.

Mo takes Dawn to the Predator's Ball in an effort to raise the capital The Jammer Group needs to pay off their debts. Blair is saddled with a weekend work assignment.

Mo and Dawn attempt to reunite Blair and Tiff.

Mo attempts to create a father/son bond with Blair. Dawn and Spencer have a lively dinner with Dawn's parents. Keith finds his secret increasingly difficult to hide.

A Hollywood screenwriter shadows Mo at the office as Mo and Dawn fight over her desire to be made a partner. Keith plays a prank on Blair.

Wide-eyed Blair is thrust into the insane world of '80s Wall Street. Mo enacts his master plan to take over the Georgina Jeans Company.