Bay and Emmett make an unexpected discovery as they deal with Matthew's blackmail threat; Daphne receives an opportunity at the clinic; a person from Kathryn's past threatens the publication of her upcoming book.

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.