Daphne, Bay and Travis head to Mexico on spring break to do volunteer work with Melody. While there, Daphne forms a surprising bond with another volunteer, Bay's anger erupts and Melody's boyfriend presents her with a life-altering suggestion.

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.