Emma returns home from Coachella bummed to the point of despair over Ethan's lies and their consequent break-up. While Kristin tries to comfort her (totally unaware that she's about to be gut-punched with the truth), Sutton takes the opportunity to act embarrassingly minxish with Ethan and rub it in Emma's face that things didn't work out. Sutton also insists that Emma be the one to tell Kristin about the locket Rebeccannie keeps with a picture of Ted in it. After Rebeccannie accidentally spills the truth that she in fact did sleep with Ted, Emma somehow feels compelled to do Sutton's bidding and break Kristin's heart just that much more.
The whole mess climaxes with a very dramatic display at Alec and Rebeccannie's rehearsal dinner, Laurel finding out her dad is a cheating bastard and Kristin looking at an old photo book as she tries to put together the puzzle of her lie of a life. Alas, as Alec reveals, she's missing at least half the pieces because there are still more secrets to be exposed.
Alec hopes none of those secrets will be his, which is basically why he and Rebeccannie decided to get married in the space of three days. As his wife, she won't have to testify against him -- or so the soap opera legal narrative goes. With the nuptials approaching, the teen detectives go into overdrive to find something to pin on Alec. While Kristin has her breakdown at the rehearsal dinner, Ethan and Sutton have broken into the Chamberlin house to go through Rebeccannie's things. They uncover the very same tire iron-wielding photo that was anonymously sent to Alec to blackmail him on Rebeccannie's computer. Scandal!
Alas, Dan's prosecutor ex says it was illegally obtained and, thus, inadmissible unless they can find the murder weapon. On the day of the wedding, Dan has cobbled enough together to procure a search warrant for the Rybak House. While Alec gets ready over at the venue, Thayer and Mads hang back to let in the police. As they search, The minutes tick down, and the ceremony begins. Dan finally uncovers the tire iron in Alec's golf bag. They bust up the wedding literally while Alec and Rebeccannie are sharing their first kiss as man and wife.
They drag off Alec in cuffs while everyone stands back in shock. Thayer takes it particularly hard since he basically orchestrated his father's downfall. Emma promises to be there for him, consoling him with an embrace just as Ethan walks in to see their newfound closeness. Up in the bridal suite, Sutton is surveying the scene like an evil mastermind. The door behind her opens, and she says, "Hi, Mom." It's Rebeccannie, who assures her their plan has gone according to plan. Lord knows how or for how long, but those sneaky hagbags have been in cahoots for some time now, and they won't stop until they take down all of Phoenix, teamwork-stylez. And that's all she wrote, folks!
Previously: Alec received a text message with an incriminating picture of him on the night of Derek's murder. Rebeccannie suggested he could avoid prosecution thinking "outside of the box" -- and inside the wedding chapel. And yet! That very night, Sutton and Thayer discovered that Rebeccannie had harbored feelings for Ted (of all people) since she left Arroyo. Speaking of undying flames, Emma feared that Ethan still had feelings for Sutton when he admitted to kissing the evil twin during a steamy scene in which Emma was almost devirginized. They say you never forget the first time (or maybe even the almost-first-time)!
Back in Phoenix, Emma is running off her rage to Taylor Swift's "Mean." Oh, Swifty! Empowering teenage girls to embrace their inner petty bitter spinster for generations to come! Ethan tracks Emma down on his bike, so she reluctantly heads over to talk to him. He refuses to let go of her, but she thinks his timing was piss-poor -- not to mention his use of Facebook terminology to confess he'd cheated on her with her twin. He promises it will never happen again, but Emma doesn't believe him. She sheepishly admits that the night at the hotel would have been her first time. He says that's exactly why he had to come clean so she wouldn't feel even more betrayed later. It's a fair point, but it doesn't make the truth hurt any less. Credits.
Emma arrives back home, still down in the dumps. It comes out that Ethan came along on the trip to Coachella. Ted and Kristin are unhappy, but they can't be truly mad when Emma leaves the room sobbing. Kristin follows her into her room and consoles her. She apologizes further for dragging "Sutton" into her doubts about Ted and Rebeccannie. She says she believes Ted that nothing happened, which Emma is relieved about. Kristin can't believe that Ethan would hurt "Sutton" like this when she stood by him during the murder allegations. Emma sobs, "Ethan has feelings for someone else." A few moments before, actual Sutton sauntered up to the window outside and is drinking in the emotional turbulence. Kristin gives "Sutton" another hug.
Meanwhile, Rebeccannie is describing her vision for the ceremony to Alec and the kids. She asks Mads to be her Maid of Honor, which Mads jumps at, mostly because it means she can get a new dress. Alec invites Thayer to be his Best Man. Thayer admits this wedding is a little sudden -- like, two days from now sudden. He wonders what the rush is. Alec acts the part of the hopeless romantic (not the calculating snake he really is), saying love makes people do crazy things and that he doesn't want to wait to start the rest of his life.