On the anniversary of Bart Bass' death, Chuck wrestles with the dilemma of following his conscience, or that of his father. Serena begins to suspect in Trip, when thank Nate, discovers that has been joined by Maureen. Dan and Vanessa attempt to navigate their newly complicated friendship. Eric and Kira make work his plan to dethrone Jenny. Meanwhile, the relationship between Lily and Rufus deteriorates when he discovers the letter from Serena's father.