Bay and Emmett work together to combat Matthew's blackmail threat and make an unexpected discovery. Daphne gets a big opportunity at the clinic but worries about how it affects her boyfriend Campbell. Meanwhile, Kathryn enjoys the perks of being the author of a highly-anticipated book, until someone from her past threatens its publication.
Switched at Birth tells the story of two teenage girls who discover they were accidentally switched as newborns in the hospital. Bay Kennish grew up in a wealthy family with two parents and a brother, while Daphne Vasquez, who lost her hearing at an early age due to a case of meningitis, grew up with a single mother in a poor neighborhood. Things come to a dramatic head when both families meet and struggle to learn how to live together for the sake of the girls.