20. Unholy Matrimony

Complete story — includes the ending

Emma and Ethan have officially broken up. Thayer questions Rebecca and his father as to why they need to plan a wedding in just two days. Sutton finds out about the breakup and quickly hits on Ethan, although he assures her that his feelings for her are long gone. Kristin runs into Alec and Rebecca and learns about their wedding. She tells Rebecca that she and Ted had "talked" and that everything was okay, which Rebecca misinterpreted and thought that Ted had finally revealed their secret to her, leaving Kristin confused. Later, Emma shows Kristin the locket that Sutton and Thayer had found. Sutton and Thayer approach Dan and Theresa for help, but Dan tells them to drop the case. Kristin begins distancing herself from Ted since she is now certain that he had lied to her. Emma goes to Thayer for support and he begins to show feelings towards her. During Ted's toast at Alec & Rebecca's dinner, Kristin storms out of the room, with Rebecca close behind. Kristin finds out about the affair, with neither Rebecca nor Ted denying it. She leaves the dinner with Emma (as Sutton) and Laurel by her side. Ethan and Sutton break into Rebecca's house during the dinner, looking for clues. They stumble upon the photo of Alec at the crime scene on her computer. Ted and Alec have a fall-out, with Ted angrily telling Alec that he never had his back - Alec reminds him that Kristin doesn't know "half the secret." Ethan wants Emma back, but she says that they're over for good. Emma (as Sutton) reluctantly attends the wedding (without any of the Mercers) to witness a plan that Dan & Thayer had come up with. Laurel shuts the door on a guilty Ted when he decides to come home. Emma (as Sutton) confronts Rebecca right before the wedding, but she insists that Alec was with her the entire night of Derek's murder. Dan and his police crew do a thorough search of Alec's house while the Rybaks are gone and find the murder weapon, a bloody tire iron, in his golf club bag. Alec gets arrested right after he is officially married. Ethan decides to go to the wedding to find Emma, but instead, sees her hugging Thayer. Sutton is shown overlooking the entire event and Rebecca walks in, with Sutton addressing her as "Mom". It is later revealed that Sutton and Rebecca had known about each other for some time and had planned for the events to occur.