Kathryn's cuddle mystery party quickly gets complicated when both John and Kathryn discover something about each other. Bay tries to get an invite to Tank's fraternity luau.
Meanwhile, Daphne plans a 21st birthday party for Campbell.
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.