Kenneth Miller

Back on patrol, the rift between Harmon and Diaz comes to a head.

When Arman mysteriously disappears, Thony and Nadia (Eva de Dominici) begrudgingly team up to look for him. Meanwhile, Fiona tries to manage the aftermath of her deportation to the Philippines and reconnects with an old flame in the all-new season premiere.

In the series premiere, Emma, a kind-hearted foster kid, has recently discovered she has an identical twin sister, Sutton. Unlike Emma, who has bounced from foster home to foster home, Sutton was adopted by wealthy parents, Ted (series star ANDY BUCKLEY) and Kristin Mercer (series star HELEN SLATER), and is seemingly living every teenager's dream life. Both girls are eager to meet each other in person, yet Sutton feels it is better to wait until she tells her adoptive parents what she has discovered. Emma and Sutton agree to continue their separate lives - but when Emma has an unfortunate encounter with her foster family and is forced to flee, the only person she can turn to is Sutton.

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 the person they think is Sutton. 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.

Questions surrounding Emma arise when Thayer (recurring guest star CHRISTIAN ALEXANDER) returns to Phoenix and everyone deals with Eduardo's (recurring guest star RICK MALAMBRI - Step Up 3D) 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 LA? 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 their friendship 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, Annie Hobbes (recurring guest star STACY EDWARDS - Make It or Break It, Superbad).