Sixteen years after being given up for adoption, Sutton Mercer goes in search of her biological birth mother. Sutton's twin, Emma takes her place in which she has to pretend to be Sutton.
Sutton's sister, Laurel, is interested in the new guy at school, but Char has called dibs on him. In LA, Sutton tracks down the family that originally adopted Emma. Mr. Mercer isn't too keen about Ethan as Sutton's boyfriend.
In a very un-Sutton-like move, Emma (still posing as Sutton) drops out of the Homecoming Queen race, but Char and Mads just won't let her quit. Sutton begins to get jealous of Emma living her life.
Emma is worried when her foster brother, Travis, shows up from Las Vegas. Travis decides to use his knowledge of Emma's situation to bribe her. Sutton is forced to go to Las Vegas when she is mistaken for Emma.
With the Mercers throwing Emma a birthday party and Sutton might coming home, Emma struggles with telling the truth about the switch. Meanwhile Sutton is heading back to phoenix, where she tricks Ethan to meet up when she poses as Emma.