Stef Foster, a committed police officer, and her partner Lena Adams, who serves as a vice principal at a school, have created a warm and supportive family environment. This family includes Stef’s biological son from a previous marriage, Brandon, along with their adopted twins, Mariana and Jesus. Their routine is unexpectedly shaken when Lena encounters Callie, a tough teenager with a history of abuse and a life spent moving between foster homes. Initially, Lena and Stef take in Callie and her brother, Jude, with the intention of providing temporary shelter until a more stable arrangement is found. However, unforeseen events alter the course of the Fosters’ lives.