With no word from Sutton, Emma must continue to take her place until she returns from Los Angeles. She also learns of "the lying games", a series of uploaded pranks Sutton and her friends used to play. Emma takes dancing lessons from Ethan to take Sutton's place at an upcoming father-daughter dance. Meanwhile, Laurel becomes suspicious of the new-and-improved Sutton and even gets a bit jealous. She later catches Emma with Ethan and assumes that Sutton is involved in a relationship with him. Emma defends Sutton's best friends, including standing up for Char against her over-the-top mother and starts to bond with them. At the dance, Emma (as Sutton) is thrown into a fight with Madeline and her drunk father, resulting in Ethan slamming him against a wall as a way of defending Emma. At home, Sutton's mother finds Emma's cell phone and confusingly answers a call from her foster brother, asking for an "Emma". Later, Sutton video-chats Emma, telling her that she has faced a few setbacks in L.A. and has to stay in town for a few more days. Sutton also discovers that Ethan has found out about Emma, whom she had never spoken to him about. As she logs off, it is shown that Sutton is actually working with Thayer, Madeline's brother who's trying to make it in L.A. despite his father's disapproval. Laurel tells her parents about Sutton and Ethan after her father becomes suspicious of him after what happened at the dance and they go upstairs to confront her about it, only to find that Ethan was in her room. At the end of the episode, it is revealed that Madeline's father was behind the theft of Sutton's laptop, meaning that he also has some secrets of his own.

After waking up from a terrifying nightmare, Emma learns that Sutton has been suffering from the exact same dream for years. With this discovery, Sutton asks Emma to reminisce on all the memories she has of her childhood with their birth mother, which for Emma is slim to none. It is not until a nighttime rendezvous with Ethan that Emma remembers pieces of her former life, allowing Sutton to locate the house in which Emma shared with their long lost mother, as well as secrets many around them have tried to hide. Will the house and the new information be the missing piece of the puzzle, or are the superstitions true? Can curiosity kill? Meanwhile, with Ethan facing a lot of trouble, Emma tries to convince Ted that Ethan is innocent. But when she pushes, Emma sees she has hit a nerve with Ted, leading her to believe that he might be hiding something. Although she does not know what, it appears Ted is feeling guilty and knows more than he is willing to share about their birth mother.

As the homecoming dance is approaching, Emma (as Sutton) is pressured to run for homecoming queen. She initially drops out of the race, but after realizing that Char and Mads have done a lot on her campaign, and the fact that it would be too suspicious for her to not go through with it, she reluctantly agrees to run against Nisha. Laurel's boyfriend Justin is also running for homecoming court and she enlists herself as his campaign manager. In L.A., Sutton and Thayer continue the search for Annie, but get a bit discouraged when they find out that there are hundreds of women with the name "Annie Hobbs" in the United States. When Ted and Emma are going through his old high school photos, he comes across a picture of his younger self, Ted, and a mystery girl and proceeds to tear it out of the album. Ted and Kristin find out that Emma is actually a very talented artist and they begin to wonder if any of her birth parents had the same skills. When Eduardo comes to Mads' house to talk about the status of her relationship, Alec comes home early and she hides him a closet. While in hiding, Eduardo overhears a phone conversation between Alec and an unknown nurse. Alec tells her to watch out for Sutton if she ever comes looking for Annie. Meanwhile, Sutton is clearly upset when Emma informs her that she is running for homecoming queen in her place and reminds her that she will take her life back. When Sutton rants to Ethan about Emma taking over her life, he defends Emma and tells her that she most likely never had the intention of telling the world about their relationship and breaks it off with her. At the homecoming dance, Sutton and Justin win the title of homecoming queen and king. During the king-and-queen dance, Ethan shows up and cuts in, asking Emma for a dance. They then share a kiss in the middle of the dance floor, officially publicizing their relationship. Alec receives a picture message of Mads and Eduardo (most likely from Nisha) and confronts Mads. When she admits that Eduardo was indeed inside their house earlier, he goes to confront him about the phone call that he might have overheard, only to be interrupted by Mads at the door. When Sutton sees the homecoming photos online, she stares at screen in disbelief when she comes across a picture of Emma and Ethan's kiss. As revenge, Sutton begins to make out with Thayer, who obviously had feelings for her despite the fact that she had a boyfriend. Emma finds the photo that Ted hid and figures out that it was a picture of Ted, Alec, and Annie as teenagers. At the end of the episode in an unknown hospital, the girls' mother, Annie, is shown furiously painting a portrait of twin girls, while many other like portraits are seen in the background.

While exchanging "Annie" information with Sutton, Emma finds out that Sutton has been staying with Thayer in L.A. and suspects that they are romantically involved, although Sutton is technically still dating Ethan. Emma confronts Ethan about the kiss and tells him that they'll never work, as she isn't who she says she is and he is dating her twin sister. Laurel and her parents invite Justin and his parents over for a barbecue, but after he continues to give excuses, Laurel decides to pay his house a visit. It turns out that Justin didn't live at the address he provided to the school and this leads Laurel to investigate what exactly is going on with her boyfriend. Sutton is using Thayer as revenge in L.A. while Thayer continues to pour his feelings out towards her. They find an art gallery that takes contributions from an artist named Annie Hobbs and are convinced that she's the one that they've been looking for. After thinking about what Emma said, Ethan breaks up with Sutton to date her, although to the rest of the world, they're still the same person. Meanwhile, backlash from Madeline and Eduardo's flirtationship continues as Mads finds out that Eduardo quit his choreographing job and is leaving town. She suspects that this has something to do with the conversation that he had with her father, and while Eduardo confirms this, he was sworn to secrecy about what exactly went on. Following Emma (as Sutton)'s suggestion, Laurel drives around Justin's suspected neighborhood and finds out that he's actually a runaway orphan trying to make it through life playing golf. Later, Emma finally decides to tell Ethan about Sutton cheating on him with Thayer, but his reaction wasn't at all what she expected and he breaks up with her for not telling her as soon as she found out. While at Char's house helping her prepare for her date with Derek (Alec's partner-in-crime), Emma sees a picture of Annie on the wall and confronts Phyllis about it, only to have her freak out and tell her that Annie moved to L.A. after Ted and Alec "broke her heart." Derek hears this and reports it to Alec. Back in L.A., Thayer is upset that Sutton is still hung over Ethan and tells her that he's leaving for a few days and that she better leave before he comes back. Emma talks to Kristin about Annie and she openly talks about what she knew about her (which was very little), much to Ted's surprise, who was eavesdropping from the hallway. Mads finds out that Eduardo had been in a car accident and is in critical condition, calling Emma (as Sutton) and Char to the hospital for support. Ethan accidentally talks about an "Emma" in front of Char, leading her to believe that he was cheating on Sutton (which is really Emma) with another girl. At the hospital, all the cards are laid out on the table as Char tells Emma (as Sutton) about Ethan's "cheating", Ethan arrives to explain the situation to a very confused Char, Thayer is about to blow Sutton & Emma's secret out of anger, and Ethan punches Thayer for getting with Sutton. In the last scene, the real Sutton is shown arriving at Dowinger Clinic, looking for Annie. The receptionist falsely tells her that Annie isn't there (as she was forewarned by Alec) and Sutton goes exploring within the clinic anyway. She finds Annie sitting in her room and as she whispers "Mom", someone grabs her from behind, to Annie's horror.

Sutton has been held hostage at the mental hospital where Annie Hobbs is being kept. Dr. Hughes calls Alec and tells him that she has the "Sutton Mercer" that he warned her about locked up. Alec then tells her to keep an eye on her because the real Sutton (actually Emma) was in a Phoenix hospital with him. After a series of misunderstandings, Dr. Hughes thinks that Sutton is actually Emma Becker pretending to be Sutton Mercer and doesn't catch on to the fact that they are twins. At the hospital, Madeline overhears Emma, Ethan, and Thayer talking about Sutton, which then leads to broken trust between Emma (as Sutton), Mads, and Char. Madeline suspects that Emma (as Sutton) has been keeping secrets from her and their friendship is strained when it matters the most. Ethan begins to show signs of jealousy when he sees Emma exchanging search information with Thayer. Emma, however, is not fully convinced that Ethan is completely over Sutton after what happened at the hospital. Alec is getting more and more suspicious of Emma (as Sutton) and tries to keep everyone away from Eduardo, who might know a secret of his or two. Meanwhile, Laurel convinces herself that Justin is "the one" and wants to take their relationship to the next step, asking her sister for advice (although unlike Sutton, Emma isn't experienced in that field at all). Thayer gets Char to talk to her new boyfriend, Derek (Alec's undercover accomplice), about why he's been exchanging multiple phone calls with Alec. Emma and Thayer hack into Ted's computer to find a password for the hospital doors after visitation hours to hopefully get more information from Eduardo. At the door, Emma runs into Ethan, who won't leave her alone, saying that he's only looking out for her. She also runs into Mads and Char, who demand to know why she's sneaking around, especially with Ethan, who they still think cheated on her with "Emma." Eduardo is in a critical state and the girls are forced out of the hospital. Alec had also paid him a visit, allowing him to keep seeing Mads as long as he doesn't say a word about the phone call he overheard. Back at Char's house, Emma (as Sutton) decides to come clean to Mads and Char (to Ethan and Thayer's concern) and tells them that she's been looking for her birth mother and that Alec has been keeping vital information about her. Mads is also shocked to find out that her father paid Eduardo to leave town, leading to his tragic accident, although their important conversation is cut short when Alec walks in to check up on his daughter. At the Dowinger clinic, Sutton gets a male nurse to let her out of her room for 15 minutes to meet Annie. Annie recognizes Sutton and Sutton is eager to ask her questions about their adoption, Ted & Alec, and why she's been in hiding. Annie reveals that either Ted or Alec told her that Emma had died that day in the Fillmore house fire and she had blamed herself all these years, driving her to insanity. When Sutton tells her that Emma was indeed alive and taking her place in Arizona, Annie goes crazy and calls security on a heartbroken Sutton. Ted and Kristin find Laurel in bed with Justin through a phone-tracking device. In the ending scene, Emma is getting dressed for bed when she finds Travis, her foster brother from Las Vegas, in her room and is shocked to find out that he knows about her being a twin.