Tripp and Letitia Darling throw Nick a luxurious birthday party on a yacht; Jeremy reveals his feelings for Lisa to the mysterious Nola Lyons; Brian is reunited with his illegitimate son; someone is arrested for murder.
The Darlings deal with funeral arrangements and the aftermath of the arrest of a suspect in the murder of Dutch George; Jeremy discovers Nola Lyons' real profession; Lisa and Nick talk about having another child; Kenny G performs.
Nick is disturbed to learn that his estranged mother is on the witness list for the prosecution in the murder case of Dutch George; Tripp convinces Patrick to reconsider clearing his conscience about his wife's death.
As Election Day nears, Patrick insists on taking his relationship with Carmelita public; Ellen's brother, Chase, demands to know the truth about his sister's death; Nick and Lisa go to couples therapy; Brian Jr. goes missing.
Nick faces an uphill battle defending Letitia in the murder case until he discovers a secret about Nola; Karen asks Nick to tell Tripp that she's marrying Simon Elder; Andrea and Brian learn shocking news after a trip to the doctor.
After Letitia hits a pretty, young bicyclist with her car, Tripp invites the woman to recuperate at the Darling mansion; Patrick is delighted with Nola's aggressive manner as his new chief of staff.
Karen happily prepares for her wedding day; Tripp, still suspicious of Simon's real motives, wants Nick to keep the wedding from happening; Patrick hires Jeremy to join his Senate team.
Patrick invites Carmelita to his inauguration; Chase threatens to go public with his accusation that Patrick murdered his sister; a gun-wielding intruder confronts Karen at Nick's apartment.
The Darlings deal with the aftermath of the shooting at Patrick's inauguration; Lisa and Nick discuss custody arrangements for Kiki.
Clark the chauffeur must appease a sexy but relentless reporter by setting straight rumors regarding the Darling family; while under house arrest, Letitia holds the Ferragamo fashion show at the Darling mansion.
Nick, Brian and Karen end up taking a trip together; Simon shares his suspicions about Jeremy with Nola.
Karen tells Nick that she is carrying Simon's baby; Simon and Tripp plan to celebrate their new partnership; Simon asks Jeremy to pull off his fake murder; Andrea learns of Brian's plans and throws him out.
Simon is secretly whisked away to the Imperial to recuperate after being stabbed by Nola; the family learns that Nick's ex-wife is writing a tell-all book about the Darling clan; Brian decides to redecorate Nick's apartment.