The Grayson 4th of July parties are legendary, but this year's festivities ignite the wrong kind of fireworks when an incriminating surveillance video pops up and breaks the bond of trust between the Graysons and their head of security, Frank. Frank won't go down without a fight, which will spell trouble for Nolan and Emily. Meanwhile, the tension between Emily and Tyler will come to a head, Daniel can't seem to catch a break, and both of the Porter boys make bold moves to get their girl.

In the excitement over Emily and Daniel's engagement party, things start to unravel for everyone; Victoria uses Conrad's father against him; Jack gets more involved; Charlotte and Emily both face problems.