Alan proposes to Lyndsey but ends up engaged to Judith. Meanwhile Jenny is afraid Brooke is breaking up with her.
Ryan tries to help Danny and Sonia get together, meanwhile the others try to find out more about the mysterious Mr K.
Complications ensue when Castle and Beckett finally try to take Senator Bracken down after finding evidence connecting him to a young woman's murder.
Olivia tries to help the vice president while the rest of the associates deal with an unexpected act of betrayal. Cyrus uncovers the truth about James' investigation and is shocked at the findings.moreless
Naomi shocks the group when she announces that she will leaving Beverly Hills immediately to start a new job in New York. Teddy makes a return, and Dixon also comes back to town from his music tour to give his relationship with Adrianna another try, but fails to show up at their designated meeting spot. Silver struggles to choose between Liam and Navid and makes a life-altering decision.moreless
Naomi tries to sabotage the bachelorette party she's hosting for Madison, Max's fiancée, and Madison's childhood crush, Nick Carter, makes an unexpected appearance. Meanwhile, at Max's bachelor party, Liam and Navid get into a fight over the situation with Silver, and both parties end with the attendees heading to jail. Ivy blames Annie and Caleb for the events that led up to Diego having to go on the run.moreless
Ron and the boys set about creating fifteen years worth of history, as Robby's teacher has become suspicious and invited them all over for dinner.
As his new boss becomes even more watchful, Michael's behavior becomes increasingly careless, Pam deals with a difficult copier, and Kelly has a new crush.
After an engineering student at CalSci is found dead from an apparent suicide, Charlie convinces Don to launch an investigation after he reads the student's thesis which asserted that the architecturally magnificent Cole Center in Los Angeles is structurally unstable. Although reluctant at first, Don and his team discover that the student's findings were correct and uncover a dangerous and surprising conspiracy. Meanwhile, Alan prepares for a first date and convinces Don and Terry to join them, hoping they might rekindle their old romance.moreless