Since concern for Sutton's safety seems to be occupying Emma's mind, she starts to let pieces of her own personality emerge. Although Emma is worried by her behavior, it seems her friends and family are enjoying the change in Sutton's character. Wanting to please the father she never had, Emma must learn to ballroom dance for the annual father-daughter dance. Realizing she is in dire need of assistance, Ethan offers to help, in turn risking revealing his and Sutton's secret relationship. Will Emma be able to put aside her worries for Sutton and shine on the dance floor? Or will the night's series of events force her to reveal her true identity?

Meanwhile, as the teenagers do anything to keep their secrets, the parents may be lying to keep life-altering secrets of their own.

After revealing Sutton's real relationship with Ethan, the Mercers insist she invite him over for dinner. Hesitant because of his obvious feelings for Emma, Ethan obliges, only to have the dinner cut short by a disturbing visit from Dan. As Emma and Ethan struggle to keep order in Arizona, Sutton and Thayer discover shocking revelations in Los Angeles pertaining to the search for the girls' birth mother. Although the outcome may not turn out to be what Sutton had hoped for, it does lead her to wonder what everyone around her has been hiding for all these years. Will Sutton be able to find the answer about why she and Emma were separated, or will her curiosity put her and her loved ones' lives in danger?

Meanwhile, Laurel falls for a new guy in school hoping she will finally have something of her own, as opposed to always being in Sutton's shadow. Unfortunately her wishful thinking is cut short when Char calls dibs on the one Laurel did not want to share.

Emma is forced to go up against Neesha for Homecoming queen which causes problems with her and Sutton. Sutton and Emma both try to find more info on their mom while Alec and Ted try to hide it.

Sutton is furious when she learns that Emma and Ethan kissed. Sutton and Emma continue to find more info about their mom. Meanwhile, Laurel becomes suspicious when Justin keeps breaking dates. Also, Mads learns Edwardo is moving and Char goes on a date with a boy she found in her pool.

Questions surrounding Emma arise when Thayer returns to Phoenix and everyone deals with Eduardo's accident. What does Emma know about the accident, and why does Thayer seem to know more about the situation even though he has been in L.A.? Sutton's friends are tired of the lies and demand answers from Emma. Not exactly knowing the whole story surrounding Eduardo's accident, will Emma finally tell Mads and Char about the switch to save their friendship, or will she risk it to save Sutton's secret?

Meanwhile, Sutton finds more trouble than she expected at Dowinger Clinic as she finally comes face to face with her mother.

With tensions already high, Emma is thrown into a tailspin when her creepy foster brother, Travis, shows up from Las Vegas. Seeing he has an upper hand with Emma, Travis decides to use his knowledge of Emma's situation to his benefit. With her relationship with Ethan still strained, she has no one to turn to and forced to go along with Travis' plan if she has any hope of getting him to leave her alone. But with her old life looming over her, will this be the straw that breaks Emma's back? Meanwhile, Sutton is forced into Emma's life when she is sent back to Las Vegas.

Secrets abound in the Mercer household and Emma has had about enough of it. When she overhears an argument between Ted and Kristen, Emma thinks she finally can put a stop to all of the lies and get some real answers out of Sutton's mom. But does Emma really think that she could pry the truth out of a secret that has been hidden for almost seventeen years? Or will the secret Kristen has been hiding turn out to be not the biggest secret lurking around the Mercer house?

Meanwhile, Sutton gets a glimpse into what Emma's life has been like when she is forced to pretend to be her sister while in Las Vegas.

On their seventeenth birthday, Emma's ideal life is about to come to an end when a vengeful Sutton makes her way back to Phoenix to get her life back.

With Sutton’s whereabouts still unknown and a threatening note delivered via Sutton’s signature packaging, Emma is feeling uncertain and on edge. So when she is invited to scout out the University of Texas’s tennis program, Emma surprises her dad and accepts the invite. Nonetheless, Emma can’t escape the fact that her twin may be gone for good. Meanwhile, Rebecca tries to help Char when her mom, Phyllis, has another drinking “episode.”

Ethan insists on helping Emma get the answers she's looking for about her twin sister. So when a tattoo sparks a memory about Sutton, Ethan pursues an explanation. But the information proves costly when Ethan heads into a situation that quickly gets out of control.

Meanwhile, Mads sneaks off to see Ryan, and Laurel continues to see Justin against her parents' wishes.