For new viewers: Do not start here. You need the context of the kidney transplant and the switch to feel the weight of the fall. For returning fans: Re-watch with an open mind. The choices that frustrated you in 2015 (Daphne going to jail, Bay leaving for London) make perfect sense a decade later.
Season 4 kicks off immediately following the high school graduation cliffhanger of Season 3. The core tension revolves around Bay Kennish’s impulsive decision to take the legal blame for Daphne Vasquez’s vandalism crimes. Bay’s Legal Limbo Switched at Birth - Season 4
One of the unsung strengths of is the screen time given to the adult cast. For new viewers: Do not start here