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.

When Ethan is implicated in a serious crime, he and Sutton leave town and hide out with his father, Ben, on the reservation where he grew up. A burgeoning tension between father and son has Sutton playing mediator, but, despite the awkwardness, she appreciates seeing a side of Ethan that she did not know when they were together.

Meanwhile, Emma is left to deal with the aftermath of Ethan’s situation when she must pretend to be witness to a scene where she was not present.

Emma wants to find out what really happened on the reservation but Ethan is avoiding her and Sutton is looking to send her packing for good. Curious about his father’s possible link to Derek’s murder, Thayer starts to doubt Alec’s alibi and begins investigating Rebecca’s past. And, Kristin grows increasingly suspicious that Ted is not telling her the entire story when it comes to Justin’s mom.

The Flipside Formal offers Emma the chance to try and trap Rebecca and Sutton in a lie, but she needs Ethan's help to pull it off. Laurel struggles with where her loyalties lie, while Kristin makes a troubling discovery that has more significance than she realizes. Jordan continues to waffle between Laurel and Mads, and Theresa's defense of Alec threatens to drive a wedge between her and Dan. Meanwhile, Rebecca and Ted, and Alec and Kristin, each reminisce about old times.